CoreHost: Remove a long-name test asset (#373)

CoreHost: Remove a long-name test asset (#373)

* CoreHost: Remove a long-name test asset

One of the Bundler test use a test-asset with a very long name.
This caused problems during `git clone` on windows systems where longname support is not enabled.

This change removes the long-named content file from the repo, and generates it from the test instead.

* Add long-name fixup for additional tests