ci(librarian): run librarian tidy when update librarian googleapis (#13699)

As discussed, add `librarian tidy` to daily workflow that updates source
and regenerates.

Author: zhumin8

.github/workflows/update_librarian_googleapis.yaml

@@ -74,9 +74,10 @@ jobs:
       run: |
         version=$(go run github.com/googleapis/librarian/cmd/librarian@latest config get version)
         echo "version=${version}" >> $GITHUB_OUTPUT
-    - name: Run librarian update
+    - name: Run librarian update & tidy
       run: |
         go run "github.com/googleapis/librarian/cmd/librarian@${STEPS_LIBRARIAN_OUTPUTS_VERSION}" update sources.googleapis
+        go run "github.com/googleapis/librarian/cmd/librarian@${{ steps.librarian.outputs.version }}" tidy
       env:
         STEPS_LIBRARIAN_OUTPUTS_VERSION: ${{ steps.librarian.outputs.version }}
     - name: Get latest commit