Remove KtExpression.isUnitExpression()

[3flex]

This function is a bit overengineered and it's simple to refactor to remove its usage.

[detekt-ci]

	Warnings
⚠️	It looks like this PR contains functional changes without a corresponding test.

Generated by 🚫 dangerJS against f10ab28

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.78%. Comparing base (6864037) to head (f10ab28).

Files	Patch %	Lines
...rbosch/detekt/rules/bugs/ImplicitUnitReturnType.kt	0.00%	0 Missing and 1 partial ⚠️
...tekt/libraries/LibraryCodeMustSpecifyReturnType.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7311   +/-   ##
=========================================
  Coverage     84.78%   84.78%           
  Complexity     3993     3993           
=========================================
  Files           576      575    -1     
  Lines         12021    12015    -6     
  Branches       2478     2476    -2     
=========================================
- Hits          10192    10187    -5     
  Misses          598      598           
+ Partials       1231     1230    -1     

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[BraisGabin]

StandardNames.FqNames.unit.shortName().asString() was so overkill for just "Unit"! 🤣

[schalkms]

Agreed