Enable question retries on single questions

[cortadocodes]

Summary

This release adds to the question retry capability already available on concurrent questions by allowing retries of single questions.

Contents (#671)

Enhancements

• Enable question retries on single questions with Child.ask
• Log when retries are prevented for an exception type in Child.ask
• Remove PYTHONUNBUFFERED warning

Refactoring

• Move retry logic from Child.ask_multiple into Child.ask

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.50%. Comparing base (ed77f40) to head (9092646).
Report is 19 commits behind head on main.

Files	Patch %	Lines
octue/resources/child.py	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #671      +/-   ##
==========================================
- Coverage   94.55%   94.50%   -0.06%     
==========================================
  Files          83       83              
  Lines        3546     3547       +1     
==========================================
- Hits         3353     3352       -1     
- Misses        193      195       +2     

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[thclark]

Couple of notes, but this is great overall - a performance boost, 150 lines code reduction, an extra feature and a simplification in logic flow. Thanks! :)