ref(sdk-crashes): Rename crash_event fixture to crash_event_cocoa (#62990)

The crash_event test fixture only contains Cocoa SDK crashes and,
therefore, can be renamed to crash_event_cocoa.

tests/sentry/utils/sdk_crashes/test_event_stripper.py

@@ -2,7 +2,7 @@ import copy
 
 import pytest
 
-from fixtures.sdk_crash_detection.crash_event import (
+from fixtures.sdk_crash_detection.crash_event_cocoa import (
     get_crash_event,
     get_crash_event_with_frames,
     get_frames,

tests/sentry/utils/sdk_crashes/test_sdk_crash_detection.py

@@ -5,7 +5,7 @@ from unittest.mock import patch
 
 import pytest
 
-from fixtures.sdk_crash_detection.crash_event import (
+from fixtures.sdk_crash_detection.crash_event_cocoa import (
     IN_APP_FRAME,
     get_crash_event,
     get_crash_event_with_frames,