Enforce magmom precedence in INCAR creation

[mattmcdermott]

Summary

• Fixes issue in Default magmom behavior causes magnetic ordering to reset between relax -> static #505. Incar MAGMOM setting precedence now follows prescribed order.
• Adds test for StaticSetGenerator to catch this (method is in base class so should apply to other generators)

TODO (if any)

• Code is in the standard Python style.
  The easiest way to handle this is to run the following in the correct sequence on
  your local machine. Start with running black on your new code. This will
  automatically reformat your code to PEP8 conventions and removes most issues. Then run
  ruff.
• Docstrings have been added in the Numpy docstring format.
  Run ruff on your code.
• Type annotations are highly encouraged. Run mypy to
  type check your code.
• Tests have been added for any new functionality or bug fixes.
• All linting and tests pass.

[codecov]

Codecov Report

Merging #506 (53f8584) into main (0978f5d) will decrease coverage by 0.08%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #506      +/-   ##
==========================================
- Coverage   75.11%   75.03%   -0.08%     
==========================================
  Files          74       74              
  Lines        6570     6570              
  Branches      952      952              
==========================================
- Hits         4935     4930       -5     
- Misses       1330     1340      +10     
+ Partials      305      300       -5     

Files Changed	Coverage Δ
src/atomate2/vasp/sets/base.py	71.05% <ø> (+1.57%)	⬆️

... and 1 file with indirect coverage changes

[utf]

Great, thanks!