feat: remove internalIP methods

[bjohansebas]

Summary

This removes the static methods internalIP and internalIPSync; with this, we would rely solely on findIP

What kind of change does this PR introduce?

docs, chore, feat

Did you add tests for your changes?

Does this PR introduce a breaking change?

If relevant, what needs to be documented once your changes are merged or what have you already documented?

https://webpack.js.org/api/webpack-dev-server/#internalipfamily-v4--v6 and https://webpack.js.org/api/webpack-dev-server/#internalipsyncfamily-v4--v6

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.56%. Comparing base (b550a70) to head (c830713).
⚠️ Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #5625      +/-   ##
==========================================
+ Coverage   83.49%   83.56%   +0.06%     
==========================================
  Files          13       13              
  Lines        2054     2050       -4     
  Branches      756      756              
==========================================
- Hits         1715     1713       -2     
+ Misses        305      303       -2     
  Partials       34       34              

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