More verbose check-links to find broken links more easily

[jtpio]

Problem

By default the check-links action fails without too much information when there is a broken link.

Example run: https://github.com/jupyter/notebook/actions/runs/3570433572/jobs/6001397371

Proposed Solution

Ideally the broken link(s) should be printed in the logs so it's easier to find and fix them.

Additional context

Noticed in https://github.com/jupyter/notebook/actions/runs/3570433572/jobs/6001397371 on https://github.com/jupyter/notebook

[jtpio]

Example run: https://github.com/jupyter/notebook/actions/runs/3570433572/jobs/6001397371

Actually for that particular run the relevant lines are where we see a second attempt made for README.md:

--------------------------------------------------------------------------------
README.md...

README.md (second attempt)...

Command '['/opt/hostedtoolcache/Python/3.10.8/x64/bin/python', '-m', 'pytest', '--noconftest', '--check-links', '--check-links-cache', '--check-links-cache-expire-after', '604800', '-raXs', '--color', 'yes', '--quiet', '-p', 'no:doctest', '-c', '_IGNORE_CONFIG', '--check-links-ignore', 'https://playwright.dev/docs/test-cli/', '--check-links-ignore', 'https://blog.jupyter.org/the-big-split-9d7b88a031a7', '--check-links-ignore', 'https://blog.jupyter.org/jupyter-ascending-1bf5b362d97e', '--check-links-ignore', 'https://github.com/.*/(pull|issues)/.*', '--check-links-ignore', 'https://github.com/search?', '--check-links-ignore', 'http://localhost.*', '--check-links-ignore', 'https://docs.github.com/.*', '--ignore-glob', 'node_modules', 'README.md', '--lf']' returned non-zero exit status 1.

However it's not clear which link in README.md causes the issue.