rewrite 'disableInstrumentations' test in config.test.js to not need so much special casing

[trentm]

The

test('disableInstrumentations', function (t) {

test in "test/config.test.js" requires a lot of special casing to exclude modules that don't even import in older node versions. This is an annoying and relatively frequent maintenance paper cut. It is obtuse for new prospective contributors of newer module instrumentations.

This test should be refactored to do some basic sanity tests, but otherwise not feel it has to cover every module that is instrumented.

[david-luna]

@trentm maybe this is already covered in #3658 ?

[trentm]

@trentm maybe this is already covered in #3658 ?

Yes, thanks. #3658 (comment) gives my reasoning for having dropped this test.