Running tests in parallel

[gavin-aguiar]

Description

Adding pytest xdist to make test run in parallel

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PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1130 (b5fb6bd) into dev (832d261) will increase coverage by 0.16%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##              dev    #1130      +/-   ##
==========================================
+ Coverage   84.92%   85.08%   +0.16%     
==========================================
  Files          32       32              
  Lines        1824     1824              
  Branches      276      276              
==========================================
+ Hits         1549     1552       +3     
+ Misses        204      201       -3     
  Partials       71       71              

Flag	Coverage Δ
unittests	85.03% <0.00%> (+0.16%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
azure_functions_worker/logging.py	47.16% <50.00%> (ø)
.../shared_memory_data_transfer/file_accessor_unix.py	77.45% <0.00%> (+2.94%)	⬆️

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