feat: Allow failing toys

[lukasheinrich]

Description

Resolves #1427

I tried to implement some basic checks for handling toys as in Issue #1427

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (cb83590) 98.28% compared to head (803b842) 97.82%.

Files	Patch %	Lines
src/pyhf/infer/calculators.py	44.44%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2128      +/-   ##
==========================================
- Coverage   98.28%   97.82%   -0.46%     
==========================================
  Files          69       69              
  Lines        4539     4555      +16     
  Branches      803      807       +4     
==========================================
- Hits         4461     4456       -5     
- Misses         45       62      +17     
- Partials       33       37       +4     

Flag	Coverage Δ
contrib	97.65% <44.44%> (-0.22%)	⬇️
doctest	?
unittests-3.10	96.09% <44.44%> (-0.21%)	⬇️
unittests-3.11	96.09% <44.44%> (-0.21%)	⬇️
unittests-3.8	96.11% <44.44%> (-0.21%)	⬇️
unittests-3.9	96.13% <44.44%> (-0.21%)	⬇️

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