Add /test to .npmignore

[angadn]

In a new GTS setup when one drops a .spec.ts file into /test and imports anything from mocha or chai, this leads to an ESLint warning for no-unpublished-import.

As the 💡 in Rule Details suggests, a .npmignore holding one line for /test could lead to a less disruptive experience for new setups.

[tonycoco]

This is probably a test-framework specific change for most:

You can try something like this in your .eslintrc:

"node/no-unpublished-import": ["error", {
    "allowModules": ["chai"]
}]