[CI] Move JIT kernel tests + benchmarks to test/registered/jit; add in-package guard (#27644)

.pre-commit-config.yaml

@@ -99,6 +99,12 @@ repos:
         files: ^test/registered/.*\.py$
         exclude: ^test/registered/.*/utils\.py$
         pass_filenames: false
+      - id: check-no-registered-tests-in-package
+        name: reject CI-registered tests inside the sglang package
+        entry: python3 scripts/ci/check_no_registered_tests_in_package.py
+        language: system
+        files: ^python/sglang/.*\.py$
+        pass_filenames: false
       - id: check-no-docs-changes
         name: reject changes under legacy docs/
         entry: python3 scripts/ci/check_no_docs_changes.py