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

• prod_branch is now called primary_branch to differentiate primary deployment of a project from many prod deployments
• prod_deployment_id is now called primary_deployment_id.

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!