fix: before implementation with custom processors

[bobvandevijver]

Description

The before implementation was never functional, as the returned tags array is a tag name indexed array of tags. This change resolves that, and adds a test to actually insert a processor with the before attribute.

What type of PR is this? (check all applicable)

• Bug Fix
• Feature
• Refactor
• Deprecation
• Breaking Change
• Documentation Update
• CI

Checklist

• I have made corresponding changes to the documentation (docs/)
• I have made corresponding changes to the changelog (CHANGELOG.md)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.56%. Comparing base (13408ab) to head (e438007).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2421      +/-   ##
==========================================
+ Coverage   89.53%   89.56%   +0.03%     
==========================================
  Files          78       78              
  Lines        2915     2914       -1     
==========================================
  Hits         2610     2610              
+ Misses        305      304       -1     

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[DjordyKoert]

Thank you!