fix(amazonq): deprecate Q inline suggestion thinking message UI

[Will-ShaoHua]

Problem

It's confusing when Q is saying it's thinking however sometimes the model returns empty suggestion thus nothing will be displayed to users. Thus the team decides to remove the UI.

Solution

---

• 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 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.

[Will-ShaoHua]

/retryBuilds

[Will-ShaoHua]

) AppBuilder Walkthrough
Create project
start with an existing template
override existing template
download serverlessland proj:
Error: Test length exceeded max duration: 30 seconds

[atonaamz]

One of the required test is failing

[Will-ShaoHua]

/retryBuilds

[Will-ShaoHua]

One of the required test is failing

feel the test is flaky

[Will-ShaoHua]

3531 passing (5m)
  14 pending
  1 failing
  1) AppBuilder Walkthrough
       Create project
         start with an existing template
           override existing template
             download serverlessland proj:
     Error: Test length exceeded max duration: 30 seconds
[No Pending UI Elements Found]
      at Timeout._onTimeout (/Users/runner/work/aws-toolkit-vscode/aws-toolkit-vscode/packages/core/src/test/setupUtil.ts:46:32)
      at listOnTimeout (node:internal/timers:588:17)
      at processTimers (node:internal/timers:523:7)