ci: add synchronize trigger to semantic PR title validation workflow

[Aaron ("AJ") Steers (aaronsteers)]

Summary

Adds synchronize to the list of event types that trigger the semantic PR title validation workflow. Without this trigger, the PR title check only runs when a PR is opened, edited, or marked ready for review - but not when new commits are pushed. This causes GitHub to show the check as "missing" or stale after pushing new commits.

Review & Testing Checklist for Human

• Confirm this matches the desired behavior: PR title validation should re-run when new commits are pushed to refresh the check status

Notes

This change aligns the workflow with other Airbyte repositories (PyAirbyte, airbyte-python-cdk, connector-builder-mcp, etc.) that already have all four triggers configured: opened, edited, ready_for_review, and synchronize.

Requested by: Aaron ("AJ") Steers (@aaronsteers)
Link to Devin run: https://app.devin.ai/sessions/9c86b01fddb14dd0a5fd73a4f019c7b2

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Pull request overview

This PR enhances the semantic PR title validation workflow by adding the synchronize trigger event. This ensures that PR title validation re-runs when new commits are pushed, preventing the check from appearing as "missing" or stale in GitHub's status display.

Changes:

• Added synchronize event type to the semantic PR title validation workflow triggers

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✅ Devin Review: No Issues Found

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