Validation for supported manifest files in the OSS relatime (AST-161513)

[cx-atish-jadhav]

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Description

Please provide a summary of the changes and the related issue. Include relevant motivation and context.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Related Issues

AST-159941

Checklist

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules
• I have updated the CLI help for new/changed functionality in this PR (if applicable)
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used

Screenshots (if applicable)

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Additional Notes

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[cx-umesh-waghode]

Looks good. Validate function could be improved.

[cx-umesh-waghode]

Approved for the tivyignore change.