Make DB lock validation CI friendly

scripts/validate_locked_db_connection.py

@@ -17,6 +17,11 @@ def main() -> int:
     for path in TARGETS:
         try:
             print(f"checking: {path}")
+            if not path.exists():
+                if path.name == "appsettings.Development.json":
+                    print(f"SKIP: {path} not present in this checkout")
+                    continue
+                raise FileNotFoundError(path)
             data = json.loads(path.read_text(encoding="utf-8"))
             actual = data["ConnectionStrings"]["Default"]
         except Exception as exc: