fix: prevent docs deploy from being cancelled by PR previews (#6553)

.github/workflows/deploy-docs-and-extensions.yml

@@ -8,8 +8,12 @@ on:
       - 'documentation/**'
 
 # Use same concurrency group as PR preview workflow to prevent race conditions
-# when both workflows try to modify gh-pages branch simultaneously
-concurrency: pr-preview
+# when both workflows try to modify gh-pages branch simultaneously.
+# cancel-in-progress: false ensures production deploys queue and wait rather than
+# being cancelled by PR preview workflows.
+concurrency:
+  group: pr-preview
+  cancel-in-progress: false
 
 jobs:
   deploy: