[Test] Consolidate test cleanup and CI taxonomy (net -11.4K lines) (#37436)

Co-authored-by: Mick Qian <mickqian@users.noreply.github.com>

test/registered/openai_server/basic/test_http2_server.py

@@ -11,7 +11,7 @@ import unittest
 import requests
 
 from sglang.srt.utils import kill_process_tree
-from sglang.test.ci.ci_register import register_amd_ci, register_cuda_ci
+from sglang.test.ci.ci_register import register_cuda_ci
 from sglang.test.test_utils import (
     DEFAULT_SMALL_MODEL_NAME_FOR_TEST,
     DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
@@ -27,8 +27,7 @@ try:
 except ImportError:
     _HAS_GRANIAN = False
 
-register_cuda_ci(est_time=108, stage="base-b", runner_config="1-gpu-small")
-register_amd_ci(est_time=150, suite="stage-b-test-1-gpu-small-amd")
+register_cuda_ci(est_time=150, stage="base-b", runner_config="1-gpu-small")
 
 
 @unittest.skipUnless(_HAS_GRANIAN, "granian not installed (pip install sglang[http2])")