chore: misc testing fixes #2930
                
     Merged
            
            
          
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Note
This PR is stacked on #2925
This PR does the following:
npm run lintinto it's own workflow job.FAST_TESTin favor ofFULL_TESTwhich now defaults to off for all test runs in CI except for one permatrix.os. This should speed up tests while still getting the full test suite running on each platform.NODE_GYP_NULL_LOGGERto suppress logs during tests instead of manually settinglog.logger.stream = nullat the top of tests. This environ is then removed from the options passed toexecFileso those tests can collect fromstdout.stdoutis suppressed in tests, the default mocha reports no longer shows extra logs and newlines.testexports for anylib/files. All tested functions are either exported directly from their own files. This involved moving some helper functions from a command file to their own file.