fix: pass token to regression job, add docs

[gontzess]

Summary

• Pass RELENG_GITHUB_TOKEN explicitly to the regression job in verify.yaml for private baton-regression repo checkout
• Add verify workflow documentation to README and docs/verify-workflow.md

Context

The regression job calls baton-regression's reusable workflow, which needs RELENG_GITHUB_TOKEN to check out the private baton-regression repo. Uses explicit secret passing rather than secrets: inherit to limit exposure to only the token needed.

Companion PR: ConductorOne/baton-regression#3 (fixes the checkout target in regression.yml)

Test plan

• After merge, update v4 tag to include this commit
• Re-run verify on a connector with regression enabled (e.g., baton-mysql) to confirm the full chain works

[coderabbitai]

Important

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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/fix-regression-secrets-and-docs

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