Refactor loop indices to use seq_along for improved readability and p…

[ehrlinger]

This pull request makes minor improvements to the codebase by replacing instances of seq_len(length(...)) with seq_along(...) for iterating over indices. This change improves code clarity and robustness by using a more idiomatic approach for indexing.

Most important changes:

Code quality improvements:

• Replaced seq_len(length(gg_dta)) with seq_along(gg_dta) in the plot.gg_roc function in R/plot.gg_roc.R to iterate over the elements more safely and idiomatically.
• Updated test loops in tests/testthat/test_gg_variable.R to use seq_along() instead of seq_len(length(...)) for both classification and regression test cases, ensuring consistency and reducing potential indexing errors. [1] [2]…erformance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.26%. Comparing base (ec215ca) to head (584a476).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files          23       23           
  Lines        1805     1805           
=======================================
  Hits         1503     1503           
  Misses        302      302           

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