Remove set of tests which checks for string "error" in clang's output.
This is something HIP can not control and can lead to failures when we
move around with C++ versions or clang decides to make some changes in
its error logging.
Change-Id: Iddbc3177d5a934bd4113e1475d0c759019270aed
[ROCm/hip-tests commit: 4ccc9677c0]