fix(esp_websocket_client): reference protocol_examples_common from IDF

This makes the 'target' example usable from the component registry.
'linux' example still has a bunch of EXTRA_COMPONENT_DIRS, but at
least we can delete the protocol_examples_common copy.

components/esp_websocket_client/examples/target/main/idf_component.yml

@@ -4,3 +4,5 @@ dependencies:
   espressif/esp_websocket_client:
     version: "^1.0.0"
     override_path: "../../../"
+  protocol_examples_common:
+    path: ${IDF_PATH}/examples/common_components/protocol_examples_common