…ing state

…in functionality

This fixes #3572, moves some complexity of "phantom groups" and "loading tests" into the package:test adapter (coordinator).

It likely introduces issues with dynamic test names that need fixing.

This will simplify things for dynamic tests that will become containers.

…ldren when building tree

…esults more reliable

…e times

This could happen using the gutter icons which would send a dynamic test + a node for each of its real test instances, which we'd previously run in a loop. These are now combined into a single regex that includes them all (but won't cause multiple runs).