build: Apply strict null checks

[TomasEng]

Description

Created a Typescript configuration file for strict null checks and added it to the relevant Github workflow. We can use this to do strict null checks in individual folders until we have covered the whole project and can set strictNullChecks to true in the main tsconfig file.

Related Issue

• Turn on strictNullChecks tsconfig #10974

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.69%. Comparing base (fd014a5) to head (30ba2b7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14499   +/-   ##
=======================================
  Coverage   95.69%   95.69%           
=======================================
  Files        1893     1893           
  Lines       24634    24634           
  Branches     2823     2823           
=======================================
  Hits        23573    23573           
  Misses        800      800           
  Partials      261      261           

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