[DPE-2102] unittest to pytest

[juditnovak]

Moving unittests to pytest

Pipeline before unittest modifications

I'm slightly unsure what causes the 3-lines difference on the 1500+ lines test module test_services.py... But if it's preferred, I can try to find the difference. (If it's sufficiently small not to worry, then I'm also good to leave it.)

---------- coverage: platform linux, python 3.9.16-final-0 -----------
Name                                      Stmts   Miss  Cover
-------------------------------------------------------------
spark8t/__init__.py                           0      0   100%
spark8t/cli/__init__.py                       3      0   100%
spark8t/cli/params.py                        29      1    97%
spark8t/cli/pyspark.py                       15     15     0%
spark8t/cli/service_account_registry.py      76     45    41%
spark8t/cli/spark_shell.py                   15     15     0%
spark8t/cli/spark_submit.py                  15     15     0%
spark8t/domain.py                           161      7    96%
spark8t/exceptions.py                        10      2    80%
spark8t/literals.py                           3      0   100%
spark8t/services.py                         527    143    73%
spark8t/utils.py                             93     16    83%
-------------------------------------------------------------
TOTAL                                       947    259    73%

======================= 53 passed, 2 warnings in 23.55s ========================
  unit: OK (30.69=setup[1.15]+cmd[2.94,0.56,26.03] seconds)
  congratulations :) (31.23 seconds)

Current pipeline

---------- coverage: platform linux, python 3.9.16-final-0 -----------
Name                                      Stmts   Miss  Cover
-------------------------------------------------------------
spark8t/__init__.py                           0      0   100%
spark8t/cli/__init__.py                       3      0   100%
spark8t/cli/params.py                        29      1    97%
spark8t/cli/pyspark.py                       15     15     0%
spark8t/cli/service_account_registry.py      76     45    41%
spark8t/cli/spark_shell.py                   15     15     0%
spark8t/cli/spark_submit.py                  15     15     0%
spark8t/domain.py                           161      7    96%
spark8t/exceptions.py                        10      2    80%
spark8t/literals.py                           3      0   100%
spark8t/services.py                         527    146    72%
spark8t/utils.py                             93     16    83%
-------------------------------------------------------------
TOTAL                                       947    262    72%

======================= 53 passed, 2 warnings in 16.23s ========================
  unit: OK (23.84=setup[1.48]+cmd[3.48,0.75,18.12] seconds)
  congratulations :) (24.29 seconds)

[deusebio]

Fine by me to migrate to pytest