🎨 Include the validation error in Unprocessable Entity reason

Just raising the `HTTPUnprocessableEntity` exception doesn't report the validation error to the client

Signed-off-by: ff137 <[email protected]>

acapy_agent/admin/server.py

@@ -176,7 +176,7 @@ async def ready_middleware(request: web.BaseRequest, handler: Coroutine):
             request.path,
             validation_error_message,
         )
-        raise
+        raise web.HTTPUnprocessableEntity(reason=validation_error_message) from e
     except (LedgerConfigError, LedgerTransactionError) as e:
         # fatal, signal server shutdown
         LOGGER.critical("Shutdown with %s", str(e))