Updated patch divisibility logic

[sarthakpati]

Fixes #522

Proposed Changes

• fixed issue of patch divisibility logic failing when unique patch size value is same as check value
• replaced sys.exit with assert for in-model logic checks for better readability

Checklist

• I have read the CONTRIBUTING guide
• My PR is based from the current GaNDLF master
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change
• Function/class source code documentation added/updated
• Code has been blacked for style consistency
• If applicable, version information has been updated in GANDLF/version.py
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file
• Usage documentation has been updated, if appropriate
• History has been updated, if appropriate
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3,4]

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[codecov]

Codecov Report

Merging #523 (e8777c8) into master (b423059) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #523      +/-   ##
==========================================
+ Coverage   93.70%   93.72%   +0.02%     
==========================================
  Files         109      109              
  Lines        6891     6886       -5     
==========================================
- Hits         6457     6454       -3     
+ Misses        434      432       -2     

Flag	Coverage Δ
unittests	93.72% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
GANDLF/models/deep_unet.py	100.00% <100.00%> (+1.58%)	⬆️
GANDLF/models/light_unet.py	98.24% <100.00%> (+1.69%)	⬆️
GANDLF/models/uinc.py	100.00% <100.00%> (+1.44%)	⬆️
GANDLF/models/unet.py	100.00% <100.00%> (ø)
GANDLF/utils/generic.py	93.24% <100.00%> (ø)
...NDLF/data/preprocessing/template_matching/utils.py	95.34% <0.00%> (-2.33%)	⬇️

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