Add Gitlab pipelines v1 to v2 upgrade docs

[oredavids]

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[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Oct 10, 2025 4:11pm

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ore/dev-1120-create-migration-docs

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