fix: validate_description to run on bot commits.

[codeon]

Summary

Currently the validate_description trigger doesn't run when a bot does a commit to a PR. In flow repo, we have bots automatically fixing formatting issues, or doing dummy commits. In those cases, the validate_description check is not run.
This leads to a forceful manual commit, tests re-run, and waste of time.

Related Issues

ISS-195199

Type of Change

• Change doesn't affect products or customers
• Bug fix (non-breaking change which fixes an issue)
• Non-breaking change (the new functionality and code refactor do not require a migration strategy)
• Breaking change (fix or feature that will require a migration plan for data or other services)
• Documentation/comment update
• Other (please describe):

Testing Procedure

Checklist

• I used generative AI to generate this PR
• I have self-reviewed my code for clarity and correctness
• I have added or updated comments for complex or non-obvious logic in my code
• I have updated relevant documentation (e.g., README, code docs)
• My changes do not introduce new warnings or errors
• I have added or updated tests to cover new or changed functionality
• All tests pass locally with my changes applied

[svc-devrev]

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[devrev-jo]

LG

[devrev-jo]

LG