Add a custom eslint rule to check for `common.skipIfEslintMissing()` to
allow tests to run from source tarballs that do not include eslint.
Fix up rule tests that were failing the new check.
Refs: https://github.com/nodejs/node/issues/20336
PR-URL: https://github.com/nodejs/node/pull/20372
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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