[Don't merge] Temporarily enable MacOS 12 / Python 3.8 / Dask test

[cjao]

• I have added the tests to cover my changes.
• I have updated the documentation and CHANGELOG accordingly.
• I have read the CONTRIBUTING document.

[codecov]

Codecov Report

Merging #1748 (8e1076b) into develop (a5f5cf9) will not change coverage.
The diff coverage is n/a.

❗ Current head 8e1076b differs from pull request most recent head 9211dff. Consider uploading reports for the commit 9211dff to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1748   +/-   ##
========================================
  Coverage    88.20%   88.20%           
========================================
  Files          191      191           
  Lines         8217     8217           
  Branches       151      151           
========================================
  Hits          7248     7248           
  Misses         864      864           
  Partials       105      105           

Flag	Coverage Δ
Dispatcher	86.68% <ø> (ø)
Functional_Tests	56.25% <ø> (ø)
SDK	91.49% <ø> (ø)
UI_Backend	91.15% <ø> (ø)
UI_Frontend	72.64% <ø> (ø)