Fix running tests against the correct versions of ESLint

[Standard8]

When I was looking at the logs of the integration runs, I noticed that the ESLint version was always 8.0.0, even for the different directories.

I realised that the npm ci had not been run, so ESLint was never installed for those sub-directories and so the tests are defaulting to the ESLint at the top-level directory.

This adds a ci option and adds it to the github actions.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (893c508) 82.35% compared to head (60e3083) 82.35%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   82.35%   82.35%           
=======================================
  Files           1        1           
  Lines          51       51           
=======================================
  Hits           42       42           
  Misses          9        9           

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[azeemba]

Thanks!