Simplify how assertions can be chained and passed as arguments

[bartfeenstra]

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[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 92.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 95.52%. Comparing base (4540b7c) to head (3800541).
Report is 27 commits behind head on 0.3.x.

Files with missing lines	Patch %	Lines
betty/serde/load.py	87.50%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            0.3.x    #1574      +/-   ##
==========================================
- Coverage   95.54%   95.52%   -0.03%     
==========================================
  Files         199      199              
  Lines       19139    19177      +38     
  Branches     3645     3659      +14     
==========================================
+ Hits        18286    18318      +32     
- Misses        584      590       +6     
  Partials      269      269              

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