Some linting improvments to water and vacuum

[je-cook]

Description

This fixes all linting problems on water_use and fixes some on vacuum while trying to avoid changes that #4493 is already aiming to accomplish

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.66667% with 74 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.12%. Comparing base (b9b6a45) to head (2f33b6f).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
process/models/vacuum.py	37.28%	74 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4491      +/-   ##
==========================================
- Coverage   49.14%   49.12%   -0.03%     
==========================================
  Files         152      152              
  Lines       29803    29805       +2     
==========================================
- Hits        14647    14641       -6     
- Misses      15156    15164       +8     

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[timothy-nunn]

Additional refactor that can be done to vacuum:

self.i_vacuum_pumping = self.data.vacuum.i_vacuum_pumping

# i_vacuum_pumping required to be compared to a b string
# as this is what f2py returns

1. The assigning of self.i_vacuum_pumping is unnecessary, its use should be replaced with the self.data.vacuum.i_vacuum_pumping
2. The comment about "b string" is not correct nor needed since the move to the Python data structure.

[clmould]

Could some descriptions be added for these vars please? Or an issue made to do this?

[je-cook]

Issue please I have no idea what they are (they may be different for each case etc)