build: remove obsolete bundling test apps (angular#60591)

This commit removes a few bundling test apps that do not provide any value, but require time on CI and during local development to update golden files.

The functionality that was tested in those apps is covered by various other tests that we have in a repository (either in the same `packages/core/test/bundling` folder or in other unit/integration tests).

PR Close angular#60591

Author: AndrewKushnir