fix: add exception to new unresolved-reference rule for data.diamond.data

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https://www.openpolicyagent.org/projects/regal/rules/imports/unresolved-reference

Author: GDYendell

regal.yaml

@@ -2,3 +2,10 @@ rules:
   idiomatic:
     no-defined-entrypoint:
       level: ignore
+
+  imports:
+    unresolved-reference:
+      level: error
+      except-paths:
+        - data.diamond.data
+        - data.diamond.data.*