build: fill in missing MATERIAL_EXPERIMENTAL_PACKAGES

[mmalerba]

I noticed that the MDC components were missing from MATERIAL_EXPERIMENTAL_PACKAGES. This PR fixes it and does some related cleanup

[devversion]

@mmalerba I see the point of doing this but I'm slightly afraid that this adds additional bloat to our build definitions and I'd personally advocate for just using tags.

e.g.

• bazel test src/... runs everything
• bazel test src/... --build_tag_filters=-e2e (runs everything except e2e)
• bazel test src/... --build_tag_filters=e2e (runs only e2e tests)

We could make shortcuts for these in the package.json then as well. Similarly to how it is done for angular/angular.

^{I don't think its worth having an additional tag for unit tests though}

[mmalerba]

Ah cool, I didn't realize that was a thing. I like that better too. I fixed a couple random issues with the BUILD files while I was doing this, so I'll re-purpose this PR for fixing those and then just use the tags as you suggested for separating the tests

[mmalerba]

@devversion PTAL

[devversion]

LGTM

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