fix: share quota bucket between Notes and ClusterNotes

Notes and ClusterNotes are the same concept at different scopes.
Use a single notes.miloapis.com/notes allowance (100) that both
types draw from, rather than separate 100-each allocations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: zachsmith1

config/services/notes.miloapis.com/quota/grant-policies/default-project-grant-policy.yaml

@@ -30,6 +30,3 @@ spec:
           - resourceType: notes.miloapis.com/notes
             buckets:
               - amount: 100
-          - resourceType: notes.miloapis.com/clusternotes
-            buckets:
-              - amount: 100