Creates anew integratin test for `ng-update` migrations. The
integration test uses an Angular CLI project that will be updated
using the latest package output symlinked from then `./dist/packages-dist`.
This allows us to ensure that migrations work in real CLI projects.
Another big benefit is that the Angular version is updated to the
latest. This is something we couldn't replicate in unit tests but
is extremely important. It's important because compilation could
break with newer Angular versions (note that migrations are always
executed after the new angular version has been installed).
PR Close#32349
Paul Gschwendtner