feat(amazonq): enable displayFindings tool

[BlakeLazarine]

Problem

Need to enable and support findings coming in from the displayFindings tool

Also - Agentic scans are supposed to use the CodeAnalysisScope of AGENTIC, which needed to be added

Solution

Set feature flag for displayFindings to be true

Listen for displayFindings messageId from FLARE similarly to how is being done for CodeReview tool.

Treat displayFindings findings and CodeReview findings separately, so they do not overwrite one another.

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[amazon-inspector-ohio]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[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.

[tsmithsz]

Could we add tests for this?