update

[rohitpaulk]

Note

Switches finalize build API path to test_runner_builder and updates the fake server to match while removing unused routes.

• Backend:
  • Update FinalizeBuild to POST to "/services/test_runner_builder/finalize_test_runner_build" in builder/internal/backend/finalize_build.go.
• Tests:
  • Change fake server route to POST /services/test_runner_builder/finalize_test_runner_build in builder/tests/lib/fake_server.rb.
  • Remove obsolete test_runner endpoints from the fake server.

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