cleanup: Remove migrated files

[charlieyu1996]

Target PR: GoogleCloudPlatform/java-docs-samples#7412

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• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

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[snippet-bot]

Here is the summary of possible violations 😱

There are 6 possible violations for removing region tag in use.

• samples/snippets/src/main/java/com/example/datacatalog/LookupEntryBigQueryDataset.java:19, tag datacatalog_bigquery_lookup_dataset(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateCustomEntry.java:19, tag data_catalog_create_custom_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateFilesetEntry.java:19, tag data_catalog_create_fileset(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/GrantTagTemplateUserRole.java:19, tag data_catalog_grant_tag_template_user_role(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/Quickstart.java:19, tag data_catalog_quickstart(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/SearchAssets.java:19, tag data_catalog_search_assets(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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You are about to delete the following sample browser pages.

• samples/snippets/src/main/java/com/example/datacatalog/CreateCustomEntry.java:19, tag data_catalog_create_custom_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateEntry.java:19, tag data_catalog_create_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateEntryGroup.java:19, tag data_catalog_create_entry_group(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateFilesetEntry.java:19, tag data_catalog_create_fileset(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/CreateTagTemplate.java:19, tag data_catalog_create_tag_template(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/DeleteEntry.java:19, tag data_catalog_delete_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/DeleteEntryGroup.java:19, tag data_catalog_delete_entry_group(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/DeleteTagTemplate.java:19, tag data_catalog_delete_tag_template(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/GetEntry.java:19, tag data_catalog_get_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/GetEntryGroup.java:19, tag data_catalog_get_entry_group(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/GetTagTemplate.java:19, tag data_catalog_get_tag_template(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/GrantTagTemplateUserRole.java:19, tag data_catalog_grant_tag_template_user_role(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/ListEntries.java:19, tag data_catalog_list_entries(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/ListEntryGroups.java:19, tag data_catalog_list_entry_groups(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/Quickstart.java:19, tag data_catalog_quickstart(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/SearchAssets.java:19, tag data_catalog_search_assets(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/UpdateEntry.java:19, tag data_catalog_update_entry(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/UpdateEntryGroup.java:19, tag data_catalog_update_entry_group(usage: page 1).
• samples/snippets/src/main/java/com/example/datacatalog/UpdateTagTemplate.java:19, tag data_catalog_update_tag_template(usage: page 1).

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Here is the summary of changes.

You are about to delete 20 region tags.

• samples/snippets/src/main/java/com/example/datacatalog/CreateCustomEntry.java:19, tag data_catalog_create_custom_entry
• samples/snippets/src/main/java/com/example/datacatalog/CreateEntry.java:19, tag data_catalog_create_entry
• samples/snippets/src/main/java/com/example/datacatalog/CreateEntryGroup.java:19, tag data_catalog_create_entry_group
• samples/snippets/src/main/java/com/example/datacatalog/CreateFilesetEntry.java:19, tag data_catalog_create_fileset
• samples/snippets/src/main/java/com/example/datacatalog/CreateTagTemplate.java:19, tag data_catalog_create_tag_template
• samples/snippets/src/main/java/com/example/datacatalog/DeleteEntry.java:19, tag data_catalog_delete_entry
• samples/snippets/src/main/java/com/example/datacatalog/DeleteEntryGroup.java:19, tag data_catalog_delete_entry_group
• samples/snippets/src/main/java/com/example/datacatalog/DeleteTagTemplate.java:19, tag data_catalog_delete_tag_template
• samples/snippets/src/main/java/com/example/datacatalog/GetEntry.java:19, tag data_catalog_get_entry
• samples/snippets/src/main/java/com/example/datacatalog/GetEntryGroup.java:19, tag data_catalog_get_entry_group
• samples/snippets/src/main/java/com/example/datacatalog/GetTagTemplate.java:19, tag data_catalog_get_tag_template
• samples/snippets/src/main/java/com/example/datacatalog/GrantTagTemplateUserRole.java:19, tag data_catalog_grant_tag_template_user_role
• samples/snippets/src/main/java/com/example/datacatalog/ListEntries.java:19, tag data_catalog_list_entries
• samples/snippets/src/main/java/com/example/datacatalog/ListEntryGroups.java:19, tag data_catalog_list_entry_groups
• samples/snippets/src/main/java/com/example/datacatalog/LookupEntryBigQueryDataset.java:19, tag datacatalog_bigquery_lookup_dataset
• samples/snippets/src/main/java/com/example/datacatalog/Quickstart.java:19, tag data_catalog_quickstart
• samples/snippets/src/main/java/com/example/datacatalog/SearchAssets.java:19, tag data_catalog_search_assets
• samples/snippets/src/main/java/com/example/datacatalog/UpdateEntry.java:19, tag data_catalog_update_entry
• samples/snippets/src/main/java/com/example/datacatalog/UpdateEntryGroup.java:19, tag data_catalog_update_entry_group
• samples/snippets/src/main/java/com/example/datacatalog/UpdateTagTemplate.java:19, tag data_catalog_update_tag_template

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