feat(upgrade): Update upgrade CLI structure to support multiple releases

[brkalow]

Description

The Upgrade CLI has been restructured to better handle current and upcoming releases. The internals have been simplified and release-specific logic has been consolidated out of the core logic.

• Remove ink usage
• Remove core-2 upgrade support. If folks need to upgrade, they can use a previous major of @clerk/upgrade
• Adds a test suite for the upgrade CLI
• Introduces a release manifest for core 3
• Introduces codemods for deprecations and breaking changes

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 698157f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/upgrade	Major

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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 brk.feat/upgrade-cli-core-3

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Project	Deployment	Preview	Comments	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Comment	Dec 6, 2025 6:29am

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commit: 698157f

[brkalow]

TODO: this should be genericized

[brkalow]

!allow-major

[brkalow]

New version/release manifest that outlines a version's impacted SDKs and changes. We can use this for only specific SDKs if necessary as well.