Fix pretty cyclic reference handling

[jcrist]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Previously cyclic references were only handled for container and dataclass types, but not namedtuple, attrs, or custom types. This fixes that, and expands the tests to cover these cases.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.64%. Comparing base (7d126c8) to head (ec54261).
Report is 730 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2524   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files          73       73           
  Lines        7840     7843    +3     
=======================================
+ Hits         7734     7737    +3     
  Misses        106      106           

Flag	Coverage Δ
unittests	98.64% <100.00%> (+<0.01%)	⬆️

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