Add VacuumPumpType enum and update references in vacuum model and tests

[chris-ashe]

Description

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.65%. Comparing base (ef96cb5) to head (ed05638).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4466   +/-   ##
=======================================
  Coverage   48.64%   48.65%           
=======================================
  Files         151      151           
  Lines       29703    29708    +5     
=======================================
+ Hits        14449    14454    +5     
  Misses      15254    15254           

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