server : speed up tests (#15836)

* server : speed up tests

* clean up

* restore timeout_seconds in some places

* flake8

* explicit offline

tools/server/tests/unit/test_basic.py

@@ -5,6 +5,12 @@ from utils import *
 server = ServerPreset.tinyllama2()
 
 
+@pytest.fixture(scope="session", autouse=True)
+def do_something():
+    # this will be run once per test session, before any tests
+    ServerPreset.load_all()
+
+
 @pytest.fixture(autouse=True)
 def create_server():
     global server