fix: Add .pubignore and dependency

[budde377]

This PR adds tests to .pubignore to reduce package size and removes dependency override.

[codecov]

Codecov Report

Merging #1068 (f1de5eb) into main (4d91cb0) will decrease coverage by 15.34%.
The diff coverage is n/a.

❗ Current head f1de5eb differs from pull request most recent head 10267fb. Consider uploading reports for the commit 10267fb to get more accurate results

@@             Coverage Diff             @@
##             main    #1068       +/-   ##
===========================================
- Coverage   55.81%   40.47%   -15.35%     
===========================================
  Files          41       13       -28     
  Lines        1521      210     -1311     
===========================================
- Hits          849       85      -764     
+ Misses        672      125      -547     

Impacted Files	Coverage Δ
packages/graphql/lib/src/links/auth_link.dart
...es/graphql/lib/src/exceptions/exceptions_next.dart
...ackages/graphql/lib/src/core/observable_query.dart
...ackages/graphql/lib/src/exceptions/network_io.dart
packages/graphql/lib/src/cache/hive_store.dart
packages/graphql/lib/src/core/fetch_more.dart
...ackages/graphql/lib/src/core/mutation_options.dart
packages/graphql/lib/src/utilities/helpers.dart
packages/graphql/lib/src/core/policies.dart
...graphql/lib/src/cache/_normalizing_data_proxy.dart
... and 18 more

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[vincenzopalazzo]

Good catch thanks!