chore(examples): lint examples/ using shared top-level eslint config; add lint:examples to 'npm run lint'

[trentm]

This adds lint:examples to the npm run lint that is run in CI. It does add 30s (on my machine) to the time to run npm run lint.

Refs: #2891

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.02%. Comparing base (4386262) to head (f81a9f6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2919      +/-   ##
==========================================
- Coverage   89.07%   89.02%   -0.05%     
==========================================
  Files         188      188              
  Lines        9223     9223              
  Branches     1900     1900              
==========================================
- Hits         8215     8211       -4     
- Misses       1008     1012       +4     

see 1 file with indirect coverage changes

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[maryliag]

is it on this PR that you can also remove the no-plusplus comments?

[trentm]

is it on this PR that you can also remove the no-plusplus comments?

Yup, I think I've done that. E.g. https://github.com/open-telemetry/opentelemetry-js-contrib/pull/2919/files#diff-9e4bcffd7dfe7072133a9ccd7f1ed71b5cd2d65b71dcf5d7c4c1791a6586e385L76 is one of them.