feat(land): add skipChecks option

[mmarchini]

skipChecks will allow skipping certain checks. Useful to skip "commit after last approval" on commit queue.

Ref: https://github.com/nodejs/node/issues/34770

[mmarchini]

I'm not 100% sure we're going to use this, but I guess it doesn't hurt to have it either.

[codecov[bot]]

Codecov Report

Merging #475 into master will increase coverage by 0.13%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #475      +/-   ##
==========================================
+ Coverage   82.56%   82.70%   +0.13%     
==========================================
  Files          34       34              
  Lines        1658     1671      +13     
==========================================
+ Hits         1369     1382      +13     
  Misses        289      289              

Impacted Files	Coverage Δ
lib/pr_checker.js	95.71% <100.00%> (+0.22%)	:arrow_up:

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[codebytere]

@mmarchini could you rebase this?

[github-actions[bot]]

This PR is stale because it has been open many days with no activity. It will be closed soon unless the stale label is removed or a comment is made.