If the vscode-pytest execution is wrapped and re-triggered then
the deletion of the file causes the second run the fail.
Deleting the file on the finally block ensures that the pytest
execution will work even if re-run.

- Move the deletion of the test IDs temp file from before pytest
  execution to a `finally` block.
- This ensures the temp file is always cleaned up, even if pytest
  execution fails or an exception occurs.
- Move `ids_path` initialization outside the try block so it's
  accessible in the finally block for cleanup.