[AMDGPU] Correct hsa-diag-v3.s test

- Use file_check -LABEL markers to prevent false positives being
  reported due to messages from different tests causing success to be
  reported.

- Add checks for all the run commands for more robust testing.

- Add checks for the absence of errors.

- Name and order tests more sensibly.

Differential Revision: https://reviews.llvm.org/D89635