feat(core): Explicitly report external hook failures

[netroy]

Summary

All external hook failures should be explicitly reported to Sentry.

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
packages/cli/src/external-hooks.ts	14.28%	5 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!