fix: migrate wsUrl host option to hostname

[anshumanv]

• 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?

existing

Motivation / Use-Case

compliant with URL spec

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #3456 (a2f689e) into master (13597a2) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3456   +/-   ##
=======================================
  Coverage   94.31%   94.31%           
=======================================
  Files          33       33           
  Lines        1301     1301           
  Branches      403      403           
=======================================
  Hits         1227     1227           
  Misses         67       67           
  Partials        7        7           

Impacted Files	Coverage Δ
bin/cli-flags.js	100.00% <ø> (ø)
lib/utils/normalizeOptions.js	98.41% <ø> (ø)
lib/Server.js	95.23% <100.00%> (ø)
lib/utils/DevServerPlugin.js	97.60% <100.00%> (ø)

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[anshumanv]

@alexander-akait CI green

[rishabh3112]

Looks good.