server : disable context shift by default (#15416)

* server : disable context shift by default

ggml-ci

* server : make scopr of test parameters local

tools/server/tests/unit/test_rerank.py

@@ -4,7 +4,7 @@ from utils import *
 server = ServerPreset.jina_reranker_tiny()
 
 
-@pytest.fixture(scope="module", autouse=True)
+@pytest.fixture(autouse=True)
 def create_server():
     global server
     server = ServerPreset.jina_reranker_tiny()