🔧 Add additional Ruff lints (and fix issues)

[danieleades]

lints are in separate commits for ease of reviewing (not every one of these lints will necessarily be of interest)

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.22222% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 90.06%. Comparing base (c3fa3db) to head (8d99f4e).

Files	Patch %	Lines
myst_parser/parsers/docutils_.py	0.00%	4 Missing ⚠️
myst_parser/mocking.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   90.06%   90.06%           
=======================================
  Files          24       24           
  Lines        3372     3373    +1     
=======================================
+ Hits         3037     3038    +1     
  Misses        335      335           

Flag	Coverage Δ
pytests	90.06% <72.22%> (+<0.01%)	⬆️

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[chrisjsewell]

there is logic in these files currently utilises runtime analysis of types, so you can't have postponed evaluation

[chrisjsewell]

hope you don't mind, but I was impatient and fixed the issues causing your changes to fail CI

[chrisjsewell]

Actually, I also reverted https://docs.astral.sh/ruff/rules/missing-trailing-comma/; I don't think it integrates well with the ruff formatter, in particular https://docs.astral.sh/ruff/settings/#format_skip-magic-trailing-comma (see also https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#the-magic-trailing-comma)