Compatibility with upcoming update of InteratomicPotentials.jl

[emmanuellujan]

• Changes required to make PotentialLearning.jl compatible with the upcoming update of InteratomicPotentials (see PR).
• Other minor modifications were introduced, such as replacing copyto! with .=.

[codecov-commenter]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (9e27c3b) 44.67% compared to head (9396123) 44.07%.

❗ Current head 9396123 differs from pull request most recent head aca727a. Consider uploading reports for the commit aca727a to get more accurate results

Files	Patch %	Lines
src/Data/utils.jl	21.73%	18 Missing ⚠️
src/Learning/linear-learn.jl	65.00%	7 Missing ⚠️
src/Learning/linear-learning-problem.jl	77.77%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   44.67%   44.07%   -0.61%     
==========================================
  Files          24       23       -1     
  Lines         761      776      +15     
==========================================
+ Hits          340      342       +2     
- Misses        421      434      +13     

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[swyant]

Looks good to me!