Limiting the num_procs to 8 (#1219)

- SWDEV-385909
- Inturns limits the NUM_PARALLEL_PROCS to 8, so the test
  shards are also max 8

(cherry picked from commit abc7a64)

Author: pruthvistony

tools/testing/test_selections.py

@@ -24,7 +24,8 @@
             if " gfx" in line:
                 count += 1
         assert count > 0  # there must be at least 1 GPU
-        NUM_PROCS = count
+        # Limiting to 8 GPUs(PROCS)
+        NUM_PROCS = 8 if count > 8 else count
     except subprocess.CalledProcessError as e:
         # The safe default for ROCm GHA runners is to run tests serially.
         NUM_PROCS = 1