clean-up analysis_options.yaml (#108747)

analysis_options.yaml

@@ -20,12 +20,6 @@ analyzer:
     strict-casts: true
     strict-raw-types: true
   errors:
-    # treat missing required parameters as a warning (not a hint)
-    missing_required_param: warning
-    # treat missing returns as a warning (not a hint)
-    missing_return: warning
-    # allow having TODO comments in the code
-    todo: ignore
     # allow self-reference to deprecated members (we do this because otherwise we have
     # to annotate every member in every test, assert, etc, when we deprecate something)
     deprecated_member_use_from_same_package: ignore