fix(clustering/rpc): added required field for mocked workspace to byp…

…ass validation (#14213)

The original constructed workspace lack required fields, this commit adds them to bypass DP's delta validation.

KAG-5897

spec/fixtures/custom_plugins/kong/plugins/rpc-notify-new-version-test/handler.lua

@@ -23,6 +23,10 @@ function RpcSyncV2NotifyNewVersioinTestHandler:init_worker()
         entity = {
           id = fake_uuid,
           name = "default",
+          -- It must contain feild "config" and "meta", otherwise the deltas
+          -- validation will fail with the error "required field missing".
+          config = {},
+          meta = {},
         },
         type = "workspaces",
         version = latest_version,