* rename test helper script
* add material to the ngcc integration test
* add MatButton to ngcc integration test checks
* remove platform-server from ngcc integration test
This package does not yet compile as it contains a package-private
(internal) decorated class, which the ngcc compiler does not yet
handle.
PR Close#26403
This commit adds an integration test for ngcc, which runs ngcc
against most @angular packages. It does not yet make any assertions
on the result.
PR Close#25406