fix: site replication issues and add tests (#13861)

- deleting policies was deleting all LDAP
  user mapping, this was a regression introduced
  in #13567

- deleting of policies is properly sent across
  all sites.

- remove unexpected errors instead embed the real
  errors as part of the 500 error response.

.github/workflows/iam-integrations.yaml

@@ -85,3 +85,7 @@ jobs:
           sudo sysctl net.ipv6.conf.all.disable_ipv6=0
           sudo sysctl net.ipv6.conf.default.disable_ipv6=0
           make test-iam
+      - name: Test LDAP for automatic site replication
+        if: matrix.ldap == 'localhost:389'
+        run: |
+          make test-site-replication