fix(headless): fix answer state using the new pattern (#4271)

[SVCC-4040](https://coveord.atlassian.net/browse/SVCC-4040)

**Problems:**

1. states of the answer aren't reset after a new request: when you click
on like/dislike/expand for example, the new query doesn't reset the
state, we still can see the button liked or disliked clicked for example
from the previous query.
2. When you submit a feedback, and re-click on likes/disliked, the
feedback modal still shows even if the feedback was successfully
submitted.

**Solutions:**

1. Reset the state when we perform a new query.
2. update `feedbackSumbitted` state when calling `sendFeedback` in the
new pattern.

**DEMO:**


https://github.com/user-attachments/assets/3377b367-5985-4045-8ad6-e072f81c9645



[SVCC-4040]:
https://coveord.atlassian.net/browse/SVCC-4040?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

packages/headless/src/controllers/knowledge/generated-answer/headless-answerapi-generated-answer.ts

@@ -13,6 +13,7 @@ import {
 import {SearchEngine} from '../../../app/search-engine/search-engine';
 import {
   resetAnswer,
+  sendGeneratedAnswerFeedback,
   updateAnswerConfigurationId,
 } from '../../../features/generated-answer/generated-answer-actions';
 import {GeneratedAnswerFeedbackV2} from '../../../features/generated-answer/generated-answer-analytics-actions';
@@ -102,6 +103,7 @@ const subscribeToSearchRequest = (
       return;
     }
     lastTriggerParams = triggerParams;
+    engine.dispatch(resetAnswer());
     engine.dispatch(fetchAnswer(state));
   };
   engine.subscribe(strictListener);
@@ -172,6 +174,7 @@ export function buildAnswerApiGeneratedAnswer(
         answerApiState: selectAnswer(engine.state).data!,
       });
       engine.dispatch(answerEvaluation.endpoints.post.initiate(args));
+      engine.dispatch(sendGeneratedAnswerFeedback());
     },
   };
 }