Build fixes: Upgrading pip to 23.0

[gavin-aguiar]

Description

DEPRECATION: azure-functions-worker is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at pypa/pip#8559

Fixes #1219

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• New Unit tests were added for the changes made and CI is passing.

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[codecov]

Codecov Report

Merging #1221 (b44d539) into dev (201c547) will decrease coverage by 51.98%.
The diff coverage is n/a.

❗ Current head b44d539 differs from pull request most recent head 957573e. Consider uploading reports for the commit 957573e to get more accurate results

@@             Coverage Diff             @@
##              dev    #1221       +/-   ##
===========================================
- Coverage   83.97%   32.00%   -51.98%     
===========================================
  Files          34       34               
  Lines        1903     1903               
  Branches      366      366               
===========================================
- Hits         1598      609      -989     
- Misses        234     1293     +1059     
+ Partials       71        1       -70     

Flag	Coverage Δ
unittests	32.00% <ø> (-51.92%)	⬇️

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see 24 files with indirect coverage changes