Allow running cocoapods-integration.tests with workflow_dispatch

Author: andrewheard

.github/workflows/cocoapods-integration.yml

@@ -17,7 +17,7 @@ concurrency:
 jobs:
   tests:
     # Don't run on private repo unless it is a PR.
-    if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
+    if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch'
 
     runs-on: macos-14
     steps: