ci: Drop --verbose from the external-link PR check

[coolguyzone]

DESCRIBE YOUR PR

The check-pr external-link check is currently unreadable. lychee.toml sets base_url = "https://docs.sentry.io" and then excludes that host (internal links are lint-404s' job) — and --verbose prints every excluded link. So the check becomes a wall of [EXCLUDED] lines with the real failures buried somewhere inside.

On #19639 that was 1,563 excluded lines around 12 actual errors.

This drops --verbose from the PR job only. The weekly full scan keeps it.

Measured on 60 files from that PR

with    --verbose:  404 lines of output
without --verbose:    9 lines

And the entire body of the quiet run is the thing you actually want:

Issues found in 1 input. Find details below.

[docs/concepts/data-management/event-grouping/stack-trace-rules.mdx]:
[404] https://github.com/getsentry/sentry/blob/.../mobile%402021-04-02.txt | Rejected status code: 404 Not Found

🔍 483 Total  ✅ 49 OK  🚫 1 Error  👻 394 Excluded  🔀 39 Redirects

Failures get more detail, not less

On a warm cache --verbose collapses errors to a bare | Error (cached). The default output gives the status and the reason:

--verbose :  [404] https://reactrouter.com/en/main/hooks/use-routes | Error (cached)
default   :  [404] https://reactrouter.com/en/main/hooks/use-routes | Rejected status code: 404 Not Found

What you lose, and why it doesn't matter here

Redirect details are verbose-only:

https://develop.sentry.dev/sdk/overview/ --[301]--> https://develop.sentry.dev/sdk/foundations/

That's genuinely useful — but not on this job. The PR run reads mostly from a shared cache, and cached entries don't re-report redirects, which is exactly why #19639's summary showed 🔀 Redirected | 0 even though the corpus has plenty. The weekly scheduled scan (args: --verbose .) populates that cache and is where redirect auditing belongs, so it keeps --verbose untouched.

The redirect count and lychee's own "re-run in verbose mode to see details" hint still appear on PRs, so nothing is silently dropped.

Verification

Tested locally with the pinned lychee 0.23.0 (the same version scripts/lint-external-links.mjs installs), against real files from #19639, with both a cold and a warm cache.

One thing I could not test locally: the job also sets jobSummary: true, and I can't exercise the action's summary generation outside CI. Non-verbose still prints per-file errors, so the summary should be unchanged — worth a glance on the first run of this PR to confirm.

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Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

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