fix(Loop): remove standalone sample_weights parameter, rely exclusively on events' sample weights

[almostintuitive]

No description provided.

[codecov]

Codecov Report

Merging #523 (2e1cb83) into main (981d7e0) will decrease coverage by 0.08%.
Report is 1 commits behind head on main.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##             main     #523      +/-   ##
==========================================
- Coverage   89.59%   89.51%   -0.08%     
==========================================
  Files         102      102              
  Lines        4794     4768      -26     
==========================================
- Hits         4295     4268      -27     
- Misses        499      500       +1     

Files	Coverage Δ
src/fold/base/classes.py	87.40% <100.00%> (+0.32%)	⬆️
src/fold/loop/backtesting.py	94.11% <100.00%> (ø)
src/fold/loop/encase.py	90.00% <ø> (ø)
src/fold/loop/training.py	84.37% <100.00%> (ø)
tests/fold/unit/test_events.py	100.00% <100.00%> (ø)
tests/fold/unit/test_loop.py	100.00% <ø> (ø)
tests/fold/unit/test_model.py	100.00% <100.00%> (ø)
tests/fold/unit/test_utils.py	100.00% <ø> (ø)
src/fold/loop/updating.py	52.94% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[szemyd]

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