make npm tasks cachable again via gradle enterprise plugin

[atomfrede]

After setting the installDirectory property the npm tasks became not cachable (as it is a file). We don't cache the node/npm installation so we can safely ignore it for the cacheable confiuration for npm install, npm build and npm tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e6e29e5) to head (b413f42).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##                main     #9239   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      2940      2940           
===========================================
  Files            734       734           
  Lines          12681     12681           
  Branches         257       257           
===========================================
  Hits           12681     12681           

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[murdos]

Thanks @atomfrede !
Is this a side effect of #9099? I guess we should now be careful when we change configuration of plugins, or id of executions.