Remove temporary buf.yaml exception (temporalio#7594)

## What changed?
- Followup to remove a buf.yaml exception

Author: lina-temporal

proto/internal/buf.yaml

@@ -12,7 +12,6 @@ breaking:
   # Uncomment this to temporarily ignore specific files or directories:
   ignore:
     # example: - temporal/server/api/.../message.proto
-    - temporal/server/api/persistence/v1/executions.proto
 
 lint:
   use: