[CQ] migrate from slated-for-removal ActionEvent APIs

[pq]

AnActionEvent.createFromDataContext is slated for removal.

EDIT: Hrmmm. Not sure how we're supposed to migrate if ActionUiKind is unavailable.

(Will have to research.)

See: #7718.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

[jwren]

Related to #7718