tests: Delete core files for successful tests

By default pytest keeps temp files for the last 3 runs of the test suite
around, but this can quickly fill up a disk due to the number of core
files we create. Configure it to only keep temp files for failed tests.

Signed-off-by: Matt Wozniski <mwozniski@bloomberg.net>

Author: godlygeek

pyproject.toml

@@ -116,3 +116,8 @@ omit = [
 
 [tool.coverage.report]
 show_missing = true
+
+[tool.pytest.ini_options]
+# pytest retains all temp files from the last 3 test suite runs by default.
+# Keep only ones for failed tests to avoid filling up a disk.
+tmp_path_retention_policy = "failed"