Add mobile CIs to list run by script for external PRs. (#18094)

### Description
<!-- Describe your changes. -->
Add the mobile CIs to the list so we check external PRs don't break
those.


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Recent external PR was found to break iOS CI after checkin

tools/python/run_CIs_for_external_pr.py

@@ -93,6 +93,10 @@ def main():
         # checks
         "onnxruntime-python-checks-ci-pipeline",
         "onnxruntime-binary-size-checks-ci-pipeline",
+        # not currently required, but running ensures we're hitting all mobile platforms
+        "Android CI Pipeline",
+        "iOS CI Pipeline",
+        "ONNX Runtime React Native CI Pipeline",
     ]
 
     # remove pipelines that have already run successfully