tests/junit_common: filter chipStar CHIP runtime lines from test stderr

chipStar prints 'CHIP info/warning/debug ...' lines to stderr on every
run. These are not test failures but caused JUnit to mark all HIP tests
as failed. Filter them out before checking whether stderr is non-empty.

Author: pvelesko

tests/junit_common.py

@@ -670,7 +670,12 @@ def run_test(index: int, test: str, spec: TestSpec, backend: str,
 
     # classify other results
     if not test_case.is_skipped() and not test_case.status:
-        if test_case.stderr:
+        # Filter out chipStar (CHIP) runtime informational/warning lines which are not errors
+        filtered_stderr = '\n'.join(
+            line for line in test_case.stderr.split('\n')
+            if not line.startswith(('CHIP info ', 'CHIP warning ', 'CHIP debug '))
+        ).strip()
+        if filtered_stderr:
             test_case.add_failure_info('stderr', test_case.stderr)
         if proc.returncode != 0:
             test_case.add_error_info(f'returncode = {proc.returncode}')