fix(cli): fix certain flags for webpack-cli serve

[knagaitsev]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

N/A

Motivation / Use-Case

Some adjustments are needed for certain flags to work as expected with webpack-cli serve.

This PR will rely on some fixes to how the webpack-cli arg parser works in here: webpack/webpack-cli#1649

Breaking Changes

N/A

Additional Info

[codecov]

Codecov Report

Merging #2722 into v4 will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v4    #2722   +/-   ##
=======================================
  Coverage   92.89%   92.89%           
=======================================
  Files          37       37           
  Lines        1295     1295           
  Branches      345      345           
=======================================
  Hits         1203     1203           
  Misses         88       88           
  Partials        4        4           

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[alexander-akait]

/cc @hiroppy