[ci] fix fail on no tests found if run with pytest_args (#3572)

### Changes

Set `set -e` to dont fail on pytest command, and run script forward to
suppress `no_test_found` return code if action runs with `pytest_args`
Disable "no file found" warning in upload step

### Reason for changes


https://github.com/openvinotoolkit/nncf/actions/runs/15164300318/job/42637948116

### Related tickets

168252


### Tests


https://github.com/openvinotoolkit/nncf/actions/runs/16051113240/job/45293751022?pr=3572

Author: AlexanderDokuchaev

.github/workflows/conformance_weight_compression.yml

@@ -45,6 +45,7 @@ jobs:
         run: pip list
       - name: Run examples test scope
         run: |
+          set +e
           python -m pytest -s -ra tests/post_training/test_quantize_conformance.py::test_weight_compression \
             --junit-xml=pytest-results.xml \
             --durations-path=tests/post_training/data/wc_test_durations.json \
@@ -66,6 +67,7 @@ jobs:
         with:
           name: wc_results_${{ matrix.group }}
           path: tmp/results.csv
+          if-no-files-found: ignore
       - name: Test Summary
         if: ${{ !cancelled() }}
         run: |