Chore: [AEA-0000] - Allow 200 response on pipeline kick off (#527)

## Summary

- 🤖 Operational or Infrastructure Change

### Details

Accommodate diff success code from GitHub when regression tests
triggered.

---------

Signed-off-by: Connor Avery <[email protected]>
Co-authored-by: Connor Avery <[email protected]>

Author: tstephen-nhs

scripts/run_regression_tests.py

@@ -85,7 +85,7 @@ def trigger_test_run(
 
     print(f"Dispatch workflow. Unique workflow identifier: {run_id}")
     assert (
-        response.status_code == 204
+        response.status_code == 204 or response.status_code == 200
     ), f"Failed to trigger test run. Expected 204, got {response.status_code}. Response: {response.text}"