Move guard clause helpers to detekt-rules-style

[3flex]

These are only used in two rules and have limited utility elsewhere.

Technically a breaking change but very unlikely to be used in any third party rules.

[detekt-ci]

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

Generated by 🚫 dangerJS against d2754f2

[codecov]

Codecov Report

Attention: Patch coverage is 38.46154% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 84.79%. Comparing base (1b00a0c) to head (d2754f2).

Files	Patch %	Lines
...in/io/gitlab/arturbosch/detekt/rules/style/Junk.kt	38.46%	0 Missing and 8 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7309      +/-   ##
============================================
+ Coverage     84.76%   84.79%   +0.02%     
  Complexity     3992     3992              
============================================
  Files           578      577       -1     
  Lines         12026    12026              
  Branches       2477     2479       +2     
============================================
+ Hits          10194    10197       +3     
+ Misses          606      598       -8     
- Partials       1226     1231       +5     

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