feat: Support multiple prod deployments

[k-anshul]

https://linear.app/rilldata/issue/PLAT-94/previewdev-deployments-with-branch-support

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!

[k-anshul]

This feels odd from the POV of user but this is necessary to maintain the invariant.

Maybe we should maintain one branch one deployment within a environment but that might make things complex to handle in UI like the path has to be org/project/env/branch and CLI commands require environment to be passed as well.