telemetry(amazonq): Removing session cleanUp before emitting the telemetry event (#6211)

## Problem
- If user clicks on Cancel button, IDE do `this.sessionCleanUp()` before
emitting the metrics

## Solution
- Removed this function `this.sessionCleanUp()`

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).

License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: laileni-aws

packages/core/src/amazonqTest/chat/controller/controller.ts

@@ -315,7 +315,6 @@ export class TestController {
             case ButtonActions.STOP_TEST_GEN:
                 testGenState.setToCancelling()
                 telemetry.ui_click.emit({ elementId: 'unitTestGeneration_cancelTestGenerationProgress' })
-                await this.sessionCleanUp()
                 break
             case ButtonActions.STOP_BUILD:
                 cancelBuild()