Make model-archiver tests runnable from any directory

[mreso]

Description

So far tests for model-archiver had to be called from model-archiver folder. This PR changes this to make them callable from any folder.

The rest is just pre-commit beautification.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• ~/serve$ pytest model-archiver/model_archiver/tests/

========================================================================================= test session starts =========================================================================================
platform linux -- Python 3.9.16, pytest-7.2.2, pluggy-1.0.0
rootdir: /home/ubuntu/serve/model-archiver
plugins: mock-3.10.0, cov-4.0.0
collected 28 items

model-archiver/model_archiver/tests/integ_tests/test_integration_model_archiver.py ..                                                                                                           [  7%]
model-archiver/model_archiver/tests/unit_tests/test_model_packaging.py ....                                                                                                                     [ 21%]
model-archiver/model_archiver/tests/unit_tests/test_model_packaging_utils.py .....................                                                                                              [ 96%]
model-archiver/model_archiver/tests/unit_tests/test_version.py .                                                                                                                                [100%]

========================================================================================= 28 passed in 0.59s ==========================================================================================

• ~/serve/model-archiver$ pytest model_archiver/tests/

========================================================================================= test session starts =========================================================================================
platform linux -- Python 3.9.16, pytest-7.2.2, pluggy-1.0.0
rootdir: /home/ubuntu/serve/model-archiver
plugins: mock-3.10.0, cov-4.0.0
collected 28 items

model_archiver/tests/integ_tests/test_integration_model_archiver.py ..                                                                                                                          [  7%]
model_archiver/tests/unit_tests/test_model_packaging.py ....                                                                                                                                    [ 21%]
model_archiver/tests/unit_tests/test_model_packaging_utils.py .....................                                                                                                             [ 96%]
model_archiver/tests/unit_tests/test_version.py .                                                                                                                                               [100%]

========================================================================================= 28 passed in 0.57s ==========================================================================================

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2191 (dd1cc93) into master (6daaa42) will not change coverage.
The diff coverage is n/a.

❗ Current head dd1cc93 differs from pull request most recent head 2bc7547. Consider uploading reports for the commit 2bc7547 to get more accurate results

@@           Coverage Diff           @@
##           master    #2191   +/-   ##
=======================================
  Coverage   71.45%   71.45%           
=======================================
  Files          73       73           
  Lines        3296     3296           
  Branches       57       57           
=======================================
  Hits         2355     2355           
  Misses        941      941           

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