refactor: consolidate is_in_ci (jit_kernel, sgl-kernel benchmarks, tests) (#21009)

sgl-kernel/benchmark/bench_sum_scale.py

@@ -6,11 +6,9 @@ import triton.language as tl
 from sgl_kernel import moe_sum_reduce as moe_sum_reduce_cuda
 from triton.testing import do_bench
 
-# CI environment detection
-IS_CI = (
-    os.getenv("CI", "false").lower() == "true"
-    or os.getenv("GITHUB_ACTIONS", "false").lower() == "true"
-)
+from sglang.utils import is_in_ci
+
+IS_CI = is_in_ci()
 
 
 @triton.jit