feat(chat): agentic chat loop stop with trigger ID for tracking conversation

[ashishrp-aws]

Problem

Currently stop button and new prompt only stop with UI changes but agentic loop continues on the background and new messages keep streaming in.

Solution

• Correcting the setup for the agentic loop.
• This stops the agentic loop completely with multiple checks.
• Trigger Id for each new user prompt linked to a token to track an agentic loop Conversation.
• Added multiple cancellation checks to stop the loop once we hit the stop condition.
• Stops the Execute Bash executions once stop is clicked

---

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

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
  • Note: beta or "experiment" features that have active users should announce fixes in the changelog.
  • If this is not a feature or fix, use an appropriate type from the title guidelines. For example, telemetry-only changes should use the telemetry type.

[ashishrp-aws]

/retryBuilds