[cf-units] Ruff fixes

[ukmo-ccbunney]

🚀 Pull Request

Description

Note: This branch is currently based on qa_reresh_pre-commit-hooks branch, but will rebase on main once that branch is merged. First relevant commit is 2fc5e4f

Addresses failing Ruff tests, as described in #526

Not exhaustive, currently addresses following (see individual commits for details)

• EM101 raw-string-in-exception
• FLY002 Consider f-string instead of string join :
  • Added noqa exception for two instances asalternatives are not great:
    • f-strings don't really help (it would be a mess)
    • triple quotes preserve indentation
    • backslash at end of string for continuation is nasty and requires manually adding \n newline
• FBT002 boolean-default-value-positional-argument.
• All instances fixed with noqa: FBT002 as would affect API
• D401 non-imperative-mood
• D404 docstring-starts-with-this
• A001 builtin-variable-shadowing

[codecov]

Codecov Report

Attention: Patch coverage is 82.27848% with 14 lines in your changes missing coverage. Please review.

Project coverage is 58.46%. Comparing base (4ad25ba) to head (2f6736e).

Files with missing lines	Patch %	Lines
cf_units/__init__.py	81.81%	12 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
+ Coverage   58.41%   58.46%   +0.04%     
==========================================
  Files          62       62              
  Lines        6435     6447      +12     
  Branches     1150     1150              
==========================================
+ Hits         3759     3769      +10     
- Misses       2385     2387       +2     
  Partials      291      291              

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