fix: host regression workflow locally to avoid private repo resolution

[gontzess]

Summary

• Copy regression.yml from baton-regression into this repo
• Update verify.yaml to reference it locally (./.github/workflows/regression.yaml) instead of cross-repo (ConductorOne/baton-regression/...@main)

Context

GitHub Actions cannot resolve nested reusable workflow references to private repos at startup time, even with access_level: "organization". This caused startup_failure / 0-job failures on every connector with regression enabled.

Hosting the workflow file here (public repo) eliminates the resolution issue. The workflow still checks out baton-regression source from main at runtime using RELENG_GITHUB_TOKEN.

Test plan

• After merge, update v4 tag
• Re-run verify on baton-mysql — regression job should start and attempt to build baton-regression

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (3)

• .github/workflows/regression.yaml is excluded by none and included by none
• .github/workflows/verify.yaml is excluded by none and included by none
• docs/verify-workflow.md is excluded by none and included by none

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Use the checkbox below for a quick retry:

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch gontzess/move-regression-workflow-local

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