chore(test_event_manager): Fully typed signatures (#72265)

Author: armenzg

pyproject.toml

@@ -645,6 +645,7 @@ module = [
     "sentry.utils.zip",
     "sentry_plugins.base",
     "tests.sentry.api.endpoints.issues.*",
+    "tests.sentry.event_manager.test_event_manager",
     "tests.sentry.grouping.test_fingerprinting",
     "tests.sentry.hybridcloud.*",
     "tests.sentry.issues",