Fix cross-repo search tag filter for ArrayField

The tags field on CollectionVersion is now an ArrayField instead of a
ForeignKey to Tag model. Update filter_by_tags to use the contains
lookup which is appropriate for ArrayFields.

Issue: AAP-53522

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: 2 people

pulp_ansible/app/galaxy/v3/filters.py

@@ -187,6 +187,4 @@ def filter_by_tags(self, qs, name, value):
         Returns:
             Queryset of CollectionVersion that matches all tags
         """
-        for tag in value.split(","):
-            qs = qs.filter(collection_version__tags__name=tag)
-        return qs
+        return qs.filter(collection_version__tags__contains=value.split(","))