Remove old skewed-join API

[RustedBones]

Part of #4459

[codecov]

Codecov Report

Merging #4808 (cd7c6c1) into main (de5f3f2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head cd7c6c1 differs from pull request most recent head c5a8278. Consider uploading reports for the commit c5a8278 to get more accurate results

@@           Coverage Diff           @@
##             main    #4808   +/-   ##
=======================================
  Coverage   62.46%   62.47%           
=======================================
  Files         282      282           
  Lines       10412    10408    -4     
  Branches      776      774    -2     
=======================================
- Hits         6504     6502    -2     
+ Misses       3908     3906    -2     

Impacted Files	Coverage Δ
...y/scio/values/PairSkewedSCollectionFunctions.scala	99.18% <100.00%> (+2.33%)	⬆️

... and 1 file with indirect coverage changes

[RustedBones]

@kellen added scalafix rule