Sync regression issues to ADO directly from labeler workflow

[Navdeep-ss]

GitHub Actions events triggered by GITHUB_TOKEN don't trigger other workflows. When regexLabeler adds the 'regression' label, syncAdo.yml never fires. This adds the ADO sync step directly into the labeler workflow (conditional on regression label being present) so regression bugs automatically create ADO work items.

Changes:

• Added regression label check via github-script
• Added conditional Azure login + ADO sync steps
• Added id-token:write permission for Azure OIDC

[Navdeep-ss]

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