watcher: Fix Smoketests to ensure correct start/stop of Watcher

Ensure that Watcher is correctly started and stopped between tests for
SmokeTestWatcherWithSecurityIT and
SmokeTestWatcherWithSecurityClientYamlTestSuiteIT.

The change here is to throw an `AssertionError` instead of `break;` to
allow the `assertBusy()` to continue to busy wait until the desired
state is reached.

closes elastic#33291
closes elastic#29877

Author: jakelandis

x-pack/qa/smoke-test-watcher-with-security/src/test/java/org/elasticsearch/smoketest/SmokeTestWatcherWithSecurityClientYamlTestSuiteIT.java

@@ -62,7 +62,7 @@ public void startWatcher() throws Exception {
                             getAdminExecutionContext().callApi("xpack.watcher.start", emptyMap(), emptyList(), emptyMap());
                     boolean isAcknowledged = (boolean) startResponse.evaluate("acknowledged");
                     assertThat(isAcknowledged, is(true));
-                    break;
+                    throw new AssertionError("waiting until stopped state reached started state");
                 case "stopping":
                     throw new AssertionError("waiting until stopping state reached stopped state to start again");
                 case "starting":
@@ -104,7 +104,7 @@ public void stopWatcher() throws Exception {
                             getAdminExecutionContext().callApi("xpack.watcher.stop", emptyMap(), emptyList(), emptyMap());
                     boolean isAcknowledged = (boolean) stopResponse.evaluate("acknowledged");
                     assertThat(isAcknowledged, is(true));
-                    break;
+                    throw new AssertionError("waiting until started state reached stopped state");
                 default:
                     throw new AssertionError("unknown state[" + state + "]");
             }

x-pack/qa/smoke-test-watcher-with-security/src/test/java/org/elasticsearch/smoketest/SmokeTestWatcherWithSecurityIT.java

@@ -63,7 +63,7 @@ public void startWatcher() throws Exception {
                         Response startResponse = adminClient().performRequest(new Request("POST", "/_xpack/watcher/_start"));
                         Map<String, Object> responseMap = entityAsMap(startResponse);
                         assertThat(responseMap, hasEntry("acknowledged", true));
-                        break;
+                        throw new AssertionError("waiting until stopped state reached started state");
                     case "stopping":
                         throw new AssertionError("waiting until stopping state reached stopped state to start again");
                     case "starting":
@@ -108,7 +108,7 @@ public void stopWatcher() throws Exception {
                     Response stopResponse = adminClient().performRequest(new Request("POST", "/_xpack/watcher/_stop"));
                     String body = EntityUtils.toString(stopResponse.getEntity());
                     assertThat(body, containsString("\"acknowledged\":true"));
-                    break;
+                    throw new AssertionError("waiting until started state reached stopped state");
                 default:
                     throw new AssertionError("unknown state[" + state + "]");
                 }