#3998 chore(ci): remove read replica subscription job from build and deploy…

… workflow

Summary

Test plan

Screenshots

Checklist

• My code follows the code style of this project and passes
  bun run lint:backend && bun run lint.
• My change requires a change to the documentation.
• I have updated the documentation
  accordingly.
• My change has adequate E2E test coverage.
• I have tested my code manually, and I have provided steps how to reproduce
  my tests
• No GHSA ids, unpublished advisory bodies or PoCs, or embargoed exploit detail in this public PR (title, body, commits, branch name).
• Security-sensitive authz / OTA / SQL / webhook / path changes reviewed against docs/agent-security-regressions.md.

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