ci: guard the edit-accuracy gate against a failed changes job

Studio: edit accuracy gate is a required status check on main, and it is the only gated
required check without a needs.changes.result guard. If changes fails its outputs are unset,
the condition is false, the job skips, and GitHub reports a skipped job as Success, so the
required check passes with nothing run.

Six sibling required checks already handle this: Build, Typecheck, Test, Test: runtime
contract, Render on windows-latest and Tests on windows-latest all carry
needs.changes.result != 'success'. This applies the same guard here.

When changes succeeds the condition is unchanged, so there is no difference on the happy path.

Author: egnaro9

.github/workflows/ci.yml

@@ -1100,7 +1100,9 @@ jobs:
   studio-edit-accuracy-gate:
     name: "Studio: edit accuracy gate"
     needs: [changes, studio-edit-accuracy]
-    if: ${{ !cancelled() && github.event_name == 'pull_request' && needs.changes.outputs.edit_accuracy == 'true' }}
+    if: ${{ !cancelled() && github.event_name == 'pull_request'
+        && (needs.changes.result != 'success'
+            || needs.changes.outputs.edit_accuracy == 'true') }}
     runs-on: ubuntu-latest
     timeout-minutes: 5
     permissions: