fix: add none and warning to clientLogLevel

[hiroppy]

fixes: #1899
ref: #1825

• 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?

hotfix and modify tests

Motivation / Use-Case

see #1899

Breaking Changes

no

Additional Info

[hiroppy]

I didn't modify the description of bin/options.js and lib/options.json because these values should be deprecated.

[hiroppy]

I created a ticket. https://github.com/webpack/webpack-dev-server/projects/1#card-21668614

[codecov]

Codecov Report

Merging #1901 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1901   +/-   ##
======================================
  Coverage      88%     88%           
======================================
  Files          14      14           
  Lines         817     817           
  Branches      259     259           
======================================
  Hits          719     719           
  Misses         84      84           
  Partials       14      14

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[alexander-akait]

Need update shapshot, maybe we can rewrite this test from shapshot to other testing style

[hiroppy]

Yes, I forgot that I have rewritten client-src. 😇

[hiroppy]

updated

[alexander-akait]

let's ignore npm audit (i don't know what the hell with npm again)

[hiroppy]

CI is green