fix(amazonq): remove profile validation

[tsmithsz]

Problem

VS Code extension startup was delayed by ~5 seconds due to profile validation logic that used jittered API calls to avoid rate limiting. This cross-validation checked if restored profiles were still valid but caused poor user experience during plugin loading.

Related PR:

• fix(amazonq): add jitter for validation call of profiles  #7534

Solution

Removed the profile cross-validation code in restoreRegionProfile() to eliminate startup delays. This trades off immediate detection of admin-deleted profiles (rare edge case) for faster plugin loading that benefits all users daily.

Testing

Generate plugin build and tested. Saw latency improvements of ~2-3s in plugin load time

---

• 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.
• 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.