Remove missed file

[kratman]

Description

Missed this file. It has been moved to pybammsolvers now

Fixes #4779

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python -m pytest (or $ nox -s tests)
• The documentation builds: $ python -m pytest --doctest-plus src (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ nox -s quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.69%. Comparing base (ef8571c) to head (7aff231).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4783   +/-   ##
========================================
  Coverage    98.69%   98.69%           
========================================
  Files          303      303           
  Lines        23226    23256   +30     
========================================
+ Hits         22923    22953   +30     
  Misses         303      303           

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