test: add common.skipIfEslintMissing

We've added a number of tests that hook into ESLint which can error
when running the test suite with the distributed tarball. This PR
adds a new test helper `common.skipIfEslintMissing` and will skip
remaining tests in a file when `ESLint` is not available at
`tools/node_modules/eslint`

PR-URL: https://github.com/nodejs/node/pull/18807


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>