Edit Unittests workflow triggers.

This should trigger unittests when a PR is opened that is aimed at "main" and will also trigger on subsequent commits and being reopened. (See discussions on https://github.com/orgs/community/discussions/25161)

PiperOrigin-RevId: 691350930

Author: Nush395

.github/workflows/pytest.yml

@@ -10,7 +10,7 @@ on:
     paths-ignore:
       - 'docs/**'
       - '*.md'
-    types: [review_requested]
+    types: [opened, synchronize, reopened]
   push:
     # Do not trigger tests for documentation or markdown docs.
     paths-ignore: