twister: add --aggressive-no-clean option

Useful option during development and when applying smaller change to the
code and verifying changes using tests. This works fine as long as no
dependencies or major changes are done, i.e. when editing few files and
in a subsystem. Use with caution and use on your own risk :-)

When building multiple tests, this provide significant boost, up to 300%
faster than when rebuilding everything from scratch or when re-running
cmake every single time.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>