ci: remove preemptive RCCL skips for gfx1151 to validate support

The RCCL tests were skipped on gfx1151 with a comment "not supported
yet" but were never actually run to confirm. Remove the skips so CI
can determine whether the current TheRock nightly ships RCCL with
gfx1151 support. If they fail, the skips will be restored.

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

Author: mapatel-amd

.github/build_tools/generate_skip_tests.py

@@ -19,18 +19,6 @@
 
 # Tests to skip per GPU target (one list per target that has skips)
 SKIP_TESTS = {
-    "gfx1151": [
-        # rccl is not supported on gfx1151 yet
-        "rccl_allgather",
-        "rccl_allreduce",
-        "rccl_broadcast",
-        "rccl_buffer_registration",
-        "rccl_device_api",
-        "rccl_gradient_allreduce",
-        "rccl_reduce",
-        "rccl_reducescatter",
-        "rccl_send_recv",
-    ],
     # Add more targets as needed, e.g.:
     # "gfx1100": [],
 }