Add auto-retry for flaky PyPerf test to improve CI stability

The test_dso_name_in_pyperf_profile test occasionally fails due to PyPerf
timeouts, particularly with Python 2.7. This is caused by timing issues in
CI environments where PyPerf may not generate profile files within the
5-second timeout.

Changes:
- Add pytest-rerunfailures==15.0 to dev-requirements.txt
- Mark test_dso_name_in_pyperf_profile with @pytest.mark.flaky(reruns=3, reruns_delay=2)

The test will now automatically retry up to 3 times with a 2-second delay
between attempts, which should handle sporadic timeout issues while still
catching genuine failures.

Related issue: Sporadic test failure observed in CI runs
Example failure: https://github.com/intel/gprofiler/actions/runs/19146096101/job/54734480910

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: mlim19

dev-requirements.txt

@@ -1,4 +1,5 @@
 pytest==8.3.5
+pytest-rerunfailures==15.0
 flake8==7.2.0
 black==25.1.0
 mypy==1.15.0

tests/test_python.py

@@ -161,6 +161,7 @@ def test_python_matrix(
         assert profile.app_metadata["sys_maxunicode"] is None
 
 
+@pytest.mark.flaky(reruns=3, reruns_delay=2)
 @pytest.mark.parametrize("in_container", [True])
 @pytest.mark.parametrize("profiler_type", ["pyperf"])
 @pytest.mark.parametrize("insert_dso_name", [False, True])