fix(cd): align verifier with nullpool budget

scripts/ops/awoooi-workload-db-identity-bootstrap.sh

@@ -382,8 +382,10 @@ spec:
                   raise RuntimeError("connection_limit_mismatch")
               if observed_limit < required_budget:
                   raise RuntimeError("connection_budget_below_required")
-              if available_connection_headroom < required_budget:
-                  raise RuntimeError("connection_headroom_below_required")
+              if available_connection_headroom < representative_probe_count:
+                  raise RuntimeError(
+                      "connection_headroom_below_probe_requirement"
+                  )
               if table_gap_count or sequence_gap_count:
                   raise RuntimeError("database_privilege_gap")
               print(json.dumps({
@@ -414,7 +416,7 @@ spec:
                   "representative_probe_count_invalid",
                   "connection_limit_mismatch",
                   "connection_budget_below_required",
-                  "connection_headroom_below_required",
+                  "connection_headroom_below_probe_requirement",
                   "database_privilege_gap",
               }
               error_code = str(exc)