[ci] Renames the override post-release label for batch release

[chunhtai]

The repo check ci will be run when creating release pr against release branch. In that case, we want to ignore the check to guard changes to changelog.md and pubspec.

The solution will be reusing the override: post-release-* label. I decide to also rename the label to override: skip-batch-release-repo-check-* since the original name is not appropriate in this use case.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the AI contribution guidelines and understand my responsibilities, or I am not using AI tools.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
• I followed the version and CHANGELOG instructions, using semantic versioning and the repository CHANGELOG style, or I have commented below to indicate which documented exception this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

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Footnotes

1. Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩ ↩²

[gemini-code-assist]

Code Review

This pull request updates the VersionAndChangelogValidator to check for the 'override: skip-batch-release-repo-check-' label instead of the 'override: post-release-' label. It also updates the corresponding tests in validate_command_version_test.dart to reflect this label change. There are no review comments, and I have no feedback to provide.

[stuartmorgan-g]

LGTM

[auto-submit]

autosubmit label was removed for flutter/packages/11835, because - The status or check suite Mac_arm64 macos_platform_tests master - packages has failed. Please fix the issues identified (or deflake) before re-applying this label.