Revert "Remove build timeout until we know why content release is slo…

…w. (#2321)" (#2323)

This reverts commit 0f53643.

Does not need pre-merge CI; nothing changes here that would be caught by CI.

.github/workflows/content-release.yml

@@ -91,7 +91,7 @@ jobs:
     runs-on: [self-hosted, asg]
     needs:
       - validate-build-status
-    # timeout-minutes: 75
+    timeout-minutes: 75
     defaults:
       run:
         working-directory: content-build