tests: Removed 70.twolf tests

tests: Removed 70.twolf tests

In an effort to cleanup the old tests, and migrate useful tests to be
executed via `test/main.py`, it has been decided that the
`test/quick/70.twolf` tests should be removed.

Jira: https://gem5.atlassian.net/browse/GEM5-109
Change-Id: I19f2e20298e14a92f49adf0b8369e1fa09e0c1bc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24383
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>