Unit tests fixes

[gavin-aguiar]

3 tests started failing with

=========================== short test summary info ============================
ERROR tests/decorators/test_dapr.py
ERROR tests/decorators/test_decorators.py
ERROR tests/decorators/test_function_app.py

E ModuleNotFoundError: No module named 'tests'

Changes:

• Adding a python -m pytests to the CI pipeline fixed this issue.
• Removed python -m pip install pytest-cov from ci pipeline since its already in .[dev]
• Merged testsutils files and moved it to utils directory

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1a43888) 93.09% compared to head (04caf39) 93.09%.

❗ Current head 04caf39 differs from pull request most recent head 41294dc. Consider uploading reports for the commit 41294dc to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #204   +/-   ##
=======================================
  Coverage   93.09%   93.09%           
=======================================
  Files          56       56           
  Lines        3243     3243           
  Branches      665      665           
=======================================
  Hits         3019     3019           
  Misses        137      137           
  Partials       87       87           

Flag	Coverage Δ
unittests	93.06% <ø> (ø)

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[vrdmr]

LGTM