test(index): loaders fails on nested imports

[cpsubrian]

Just a Failing Test ATM

This adds a failing test case that shows that the webpack loaders are not run on nested imports. I'm honestly not sure what the solution is but at least we have a test 😄

The expected output of import-nested.less should be:

.top-import {
      background: hotpink;
}
.nested-import {
      background: hotpink;
}

But, instead you get the following (because the loaders are not run on the nested import):

.top-import {
      background: hotpink;
}
.nested-import {
      background: <%= color %>;
}

[jsf-clabot]

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[michael-ciniawsky]

@cpsubrian Can elaborate on this test case a bit more please ?