tests : clean-up server test, use tests.sh in ci (#26886)

* tests : remove fetch_server_test_models.py

* ci : use tests.sh wrapper of pytest

tools/server/tests/tests.sh

@@ -6,11 +6,6 @@ cd $SCRIPT_DIR
 
 set -eu
 
-if [[ "${SLOW_TESTS:-0}" == 1 ]]; then
-    # Slow tests for tool calls need quite a few models ahead of time to avoid timing out.
-    python $SCRIPT_DIR/../../../scripts/fetch_server_test_models.py
-fi
-
 if [ $# -lt 1 ]
 then
     if [[ "${SLOW_TESTS:-0}" == 1 ]]; then