[WICG/webcomponents] We need the ability to deregister or undefine custom elements. (Issue #970)

There have been a couple of previous tickets created about this but they have been closed:
https://github.com/webcomponents/webcomponents.org/issues/1294
https://github.com/WICG/webcomponents/issues/754

This is another use case which has not been brought up before, but an important one.

**During unit tests, if we are unable to clean up and reset the browser state, then you break all future unit tests.**

Please see my Stack Overflow post for a detailed explanation of the problem:
https://stackoverflow.com/questions/73849002/unit-tests-of-angular-elements-registered-with-the-customelementregistry-as-a-h

Custom elements are a very powerful feature, but not being able to write tests for using them really undermines their adoption.

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