feat(amazonq): adapt feature flag for CodeReviewInChat, emit metrics for explainIssue, applyFix

[BlakeLazarine]

Problem

Adapt the CodeReviewInChat feature flag so that it applies to redirecting the commands which invoke /review

Emit telemetry events for explainIssue and applyFix

Solution

Move the feature flag value to a common location where it will be consumed

add telemetry emits based on earlier implementation

Set CodeReviewInChat feature flag to true (Requires merge after aws/language-servers#1964)

The duplicate code was not introduced by the commits in this PR, so we can ignore.

---

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• 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.

[BlakeLazarine]

/retryBuilds

[laileni-aws]

Why do we need this ?

[BlakeLazarine]

This is for re-directing the command >Amazon Q: Run Project Review in the top menu