Get rid of the Union (#6246)

* Get rid of the Union

* updating DIRECTORY.md

* Get rid of the Union

* Remove the redundant pre-commit runs.

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

.github/workflows/pre-commit.yml

@@ -1,6 +1,10 @@
 name: pre-commit
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   pre-commit: