Fix resolve install in old npm version on CI.

[rasmi]

On Node < 10 in CI, linklocal replaces the published resolver with a symlink to the local source, but old npm doesn't install the local source's nested dependencies, so resolve@2 (added in 9222532) is missing and the resolver crashes. The fix adds (cd resolvers/node && npm install) to dep-time-travel.sh to install the missing nested deps before tests run.

Also, extends the timeout for the first webpack resolver test on old node + macos because it's a bit over the current 5s timeout. The initial load here takes longer.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.50%. Comparing base (9222532) to head (2bd1e28).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3237      +/-   ##
==========================================
+ Coverage   95.39%   95.50%   +0.10%     
==========================================
  Files          83       83              
  Lines        3689     3689              
  Branches     1332     1332              
==========================================
+ Hits         3519     3523       +4     
+ Misses        170      166       -4     

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[ljharb]

this should probably run for every subdir inside resolvers, so it covers the webpack one too

[rasmi]

Done.

[rasmi]

Extended timeout on the one failing test for old macos as it just takes a little longer for the initial webpack resolver load.

[danielhjacobs]

Since it was already approved, what is stopping this from being merged to unblock #3230 to unblock jsx-eslint/eslint-plugin-react#3979?