chore: complete migration of pandas-gbq

[jskeet]

Removed skip_generate and regenerated with Librarian.

[gemini-code-assist]

Code Review

This pull request enables generation for the pandas-gbq library by removing the skip_generate flag in librarian.yaml and updates the .repo-metadata.json file with alphabetically sorted keys. Feedback indicates that the codeowner_team field was removed during the metadata update and should be restored to maintain automation for PR assignments.

[gemini-code-assist]

The codeowner_team field was removed during the regeneration process. This field is important for identifying the teams responsible for this package and is used by automation for PR assignments. Please restore it while maintaining the alphabetical order of the keys.

Suggested change

	"client_documentation": "https://googleapis.dev/python/pandas-gbq/latest/",
	"distribution_name": "pandas-gbq",
	"client_documentation": "https://googleapis.dev/python/pandas-gbq/latest/",
	"codeowner_team": "@googleapis/cloud-sdk-python-team @googleapis/bigquery-dataframe-team",
	"distribution_name": "pandas-gbq",

[chalmerlowe]

@jskeet I don't yet know what the cause is, but for the life of me, I could not get the pandas-gbq prerelease to complete in one of my PRs. The logs die part way through the run, so I was never able to see what the cause was.

I looked at your logs for unittest/prerelease and they are identical to what I was seeing in other PRs. If I find a solution I will let you know.