fix: remove unused invocation test file #221

Job	Run time
Tox test (py38)	2m 48s
Tests on paywalled platforms (macos-13-xlarge, 3.12)	1m 8s
Tests on other platforms (windows-2019, 3.10)	3m 38s
Tox test (py39)	2m 51s
Tests on other platforms (windows-2022, 3.11)	3m 28s
Tox test (py310)	2m 53s
Tests on other platforms (windows-2022, 3.12)	3m 27s
Tox test (py311)	2m 42s
Tests on other platforms (macos-12, 3.11)	3m 5s
Tox test (py312-cover)	5m 22s
Tests on other platforms (macos-13, 3.12)	3m 55s
Tox test (docs, graphviz)	2m 8s
Docker image	50s
PyPI packaging	0s
	38m 15s

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