Removed soil_moisture_capacity from hydrology constants

[jacobcook1995]

Description

This PR removes the soil_moisture_capacity from HydroConsts as it is duplicated in CoreConsts, which is a possible source of confusion.

Fixes #768

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (c3a2907) to head (644d4c0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #785      +/-   ##
===========================================
- Coverage    94.54%   94.54%   -0.01%     
===========================================
  Files           74       74              
  Lines         5040     5038       -2     
===========================================
- Hits          4765     4763       -2     
  Misses         275      275              

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[vgro]

LGTM