Closes #3980: add flake8 checks for unit tests to CI #8476

Job	Run time
docs	2m 14s
docs	3m 58s
flake8	1m 26s
flake8	1m 26s
arkouda_makefile_almalinux (3.9)	2m 16s
arkouda_makefile_almalinux (3.9)	19m 20s
lint	3s
lint	3s
arkouda_python_portability (3.9)	1m 9s
arkouda_python_portability (3.9)	14m 2s
arkouda_makefile_almalinux (3.10)	2m 15s
arkouda_makefile_almalinux (3.10)	19m 9s
arkouda_python_portability (3.10)	1m 10s
arkouda_python_portability (3.10)	13m 34s
mypy	1m 44s
mypy	1m 44s
arkouda_python_portability (3.11)	1m 5s
arkouda_python_portability (3.11)	13m 8s
arkouda_makefile_almalinux (3.11)	2m 16s
arkouda_makefile_almalinux (3.11)	16m 46s
arkouda_benchmark_linux (chapel, 2)	2m 14s
arkouda_benchmark_linux (chapel, 2)	9m 1s
arkouda_chpl_portability (2.0.0)	2m 12s
arkouda_chpl_portability (2.0.0)	13m 41s
arkouda_makefile (3.9)	2m 13s
arkouda_makefile (3.9)	16m 42s
arkouda_chpl_portability (2.1.0)	2m 12s
arkouda_chpl_portability (2.1.0)	13m 14s
arkouda_makefile (3.10)	2m 12s
arkouda_makefile (3.10)	16m 47s
arkouda_chpl_portability (2.2.0)	2m 13s
arkouda_chpl_portability (2.2.0)	12m 57s
arkouda_multi-dim (2.0.0)	2m 13s
arkouda_multi-dim (2.0.0)	19m 36s
arkouda_makefile (3.11)	2m 13s
arkouda_makefile (3.11)	16m 33s
arkouda_tests_linux (chapel, 2)	2m 12s
arkouda_tests_linux (chapel, 2)	15m 18s
	4h 32m 31s

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