limit the env field to 64 chars to match the valid name check

Author: saponifi3d

src/sentry/snuba/snuba_query_validator.py

@@ -90,7 +90,11 @@ class SnubaQueryValidator(BaseDataSourceValidator[QuerySubscription]):
     query = serializers.CharField(required=True, allow_blank=True)
     aggregate = serializers.CharField(required=True)
     time_window = serializers.IntegerField(required=True)
-    environment = serializers.CharField(required=True, allow_null=True)
+    environment = serializers.CharField(
+        required=True,
+        allow_null=True,
+        max_length=64,
+    )
     event_types = serializers.ListField(
         child=serializers.CharField(),
     )