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

❌ Patch coverage is 40.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.88%. Comparing base (10488f0) to head (116f995).

Files with missing lines	Patch %	Lines
src/pyhf/infer/calculators.py	40.00%	10 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2128      +/-   ##
==========================================
- Coverage   98.23%   97.88%   -0.35%     
==========================================
  Files          65       65              
  Lines        4193     4211      +18     
  Branches      591      595       +4     
==========================================
+ Hits         4119     4122       +3     
- Misses         45       56      +11     
- Partials       29       33       +4     

Flag	Coverage Δ
contrib	97.69% <40.00%> (-0.28%)	⬇️
doctest	?
unittests-3.10	96.01% <40.00%> (-0.27%)	⬇️
unittests-3.11	96.01% <40.00%> (-0.27%)	⬇️
unittests-3.12	96.01% <40.00%> (-0.27%)	⬇️
unittests-3.8	96.01% <40.00%> (-0.27%)	⬇️
unittests-3.9	96.05% <40.00%> (-0.27%)	⬇️

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