[mypy] Disallowing implicit optional

[john-bodley]

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• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

@villebro the reason Mypy was missing the optional None in #9138 was because no_implicit_optional = true needs to be defined within the global [mypy] section. This PR sets this flag globally.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

CI.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

to: @villebro

[codecov-io]

Codecov Report

Merging #9150 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9150   +/-   ##
=======================================
  Coverage   59.06%   59.06%           
=======================================
  Files         372      372           
  Lines       11922    11922           
  Branches     2919     2919           
=======================================
  Hits         7042     7042           
  Misses       4698     4698           
  Partials      182      182

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[craig-rueda]

LGTM

[villebro]

Thanks for fixing!