Use standardized name for integration test working folder

No functional change, and neither is necessarily superior, but this is how it is in the "template", and so it must be
here as well.

Author: per1234

tests/conftest.py

@@ -122,6 +122,6 @@ def working_dir(tmpdir_factory) -> str:
     """Create a temporary folder for the test to run in. It will be created before running each test and deleted at the
     end. This way all the tests work in isolation.
     """
-    work_dir = tmpdir_factory.mktemp(basename="TestWorkingDir")
+    work_dir = tmpdir_factory.mktemp(basename="IntegrationTestWorkingDir")
     yield os.path.realpath(work_dir)
     shutil.rmtree(work_dir, ignore_errors=True)