bulk_create: Mark bulk_create_streams as nocoverage.

It's only used in `populate_db`, so it gets tested that way.

tools/test-backend

@@ -93,7 +93,6 @@ not_yet_fully_covered = {
     'zerver/lib/unminify.py',
     'zerver/lib/utils.py',
     # Low priority for coverage
-    'zerver/lib/bulk_create.py',
     'zerver/lib/ccache.py',
     'zerver/lib/generate_test_data.py',
     'zerver/lib/statistics.py',

zerver/lib/bulk_create.py

@@ -58,8 +58,9 @@ def bulk_create_users(realm: Realm,
                          recipient=recipients_by_email[email]))
     Subscription.objects.bulk_create(subscriptions_to_create)
 
+# This is only sed in populate_db, so doesn't realy need tests
 def bulk_create_streams(realm: Realm,
-                        stream_dict: Dict[Text, Dict[Text, Any]]) -> None:
+                        stream_dict: Dict[Text, Dict[Text, Any]]) -> None:  # nocoverage
     existing_streams = frozenset([name.lower() for name in
                                   Stream.objects.filter(realm=realm)
                                   .values_list('name', flat=True)])