Update the AG0042 rule to be more generic

[rannes]

Closes #195

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.99%. Comparing base (7e9c705) to head (307fef3).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...AgodaCustom/AG0042ElementHandlerShouldNotBeUsed.cs	93.75%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #198   +/-   ##
=======================================
  Coverage   74.98%   74.99%           
=======================================
  Files          69       69           
  Lines        2538     2551   +13     
  Branches      304      310    +6     
=======================================
+ Hits         1903     1913   +10     
- Misses        559      560    +1     
- Partials       76       78    +2     

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[HuiSou]

based on our offline discussion, this is a good idea, let's try to roll it out and see what's the impact to engineer