Remove CarSystemUIRavenTests and CarLibHostUnitTest from presubmit temporarily

They didn't seem to be executed on presubmit and there's some failure.

Let's disable them for now.

Bug: 440069724
Flag: TEST_ONLY
Test: presubmit
Change-Id: Ia5140c0bc45314050f8b0d5c55539e92413568d7