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

.github/workflows/server.yml

@@ -104,21 +104,21 @@ jobs:
         id: server_integration_tests
         run: |
           cd tools/server/tests
-          pytest -v -x -m "not slow"
+          ./tests.sh
 
       - name: Slow tests
         id: server_integration_tests_slow
         if: ${{ github.event.schedule || github.event.inputs.slow_tests == 'true' }}
         run: |
           cd tools/server/tests
-          SLOW_TESTS=1 pytest -v -x
+          SLOW_TESTS=1 ./tests.sh
 
       - name: Tests (Backend sampling)
         id: server_integration_tests_backend_sampling
         run: |
           cd tools/server/tests
           export LLAMA_ARG_BACKEND_SAMPLING=1
-          pytest -v -x -m "not slow"
+          ./tests.sh
 
       - name: Slow tests (Backend sampling)
         id: server_integration_tests_slow_backend_sampling
@@ -126,7 +126,7 @@ jobs:
         run: |
           cd tools/server/tests
           export LLAMA_ARG_BACKEND_SAMPLING=1
-          SLOW_TESTS=1 pytest -v -x
+          SLOW_TESTS=1 ./tests.sh
 
   windows:
     runs-on: windows-2025
@@ -170,7 +170,7 @@ jobs:
         run: |
           cd tools/server/tests
           $env:PYTHONIOENCODING = ":replace"
-          pytest -v -x -m "not slow"
+          ./tests.sh
 
       - name: Slow tests
         id: server_integration_tests_slow
@@ -178,4 +178,4 @@ jobs:
         run: |
           cd tools/server/tests
           $env:SLOW_TESTS = "1"
-          pytest -v -x
+          ./tests.sh