refactor(LocalRunnerClient): allow injecting action watch path

Context:
The hardcoded action watch path made LocalRunnerClient difficult to test and
tightened it to a specific runtime layout. Injecting the watch path improves
testability and allows the runner to work in different runtime environments.

Partner-Main/src/test/java/experimental/SystemTest.java

@@ -41,7 +41,7 @@ public class SystemTest {
     void localRunnerClientTest() {
         Map<String, MetaActionInfo> existedMetaActions = new HashMap<>();
         ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor();
-        RunnerClient client = new LocalRunnerClient(existedMetaActions, executor);
+        RunnerClient client = new LocalRunnerClient(existedMetaActions, executor, null);
         JSONObject res = client.listSysDependencies();
         System.out.println(res.toString());
     }