Refactor: Remove ICommand

[ScarletKuro]

Description

Tracked under #8435

Resubmit of v7 PR: #7135

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.74%. Comparing base (9937991) to head (88d908d).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8436      +/-   ##
==========================================
+ Coverage   88.73%   88.74%   +0.01%     
==========================================
  Files         416      416              
  Lines       12372    12370       -2     
  Branches     2459     2458       -1     
==========================================
  Hits        10978    10978              
+ Misses        862      860       -2     
  Partials      532      532              

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[ScarletKuro]

Link to migration guide: #8447