fix: improve schema for watch options

[snitin315]

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

For Bugs and Features; did you add new tests?

Yes.

Motivation / Use-Case

Resolve https://github.com/webpack/webpack-dev-server/issues/4362

https://user-images.githubusercontent.com/46647141/166394544-718aa5d7-9e0b-4d40-b297-5a1e3ade031e.mov

Breaking Changes

No

Additional Info

No

[codecov[bot]]

Codecov Report

Merging #4424 (c2fee3b) into master (c2fee3b) will not change coverage. The diff coverage is n/a.

:exclamation: Current head c2fee3b differs from pull request most recent head ae2312b. Consider uploading reports for the commit ae2312b to get more accurate results

@@           Coverage Diff           @@
##           master    #4424   +/-   ##
=======================================
  Coverage   92.42%   92.42%           
=======================================
  Files          16       16           
  Lines        1597     1597           
  Branches      598      598           
=======================================
  Hits         1476     1476           
  Misses        112      112           
  Partials        9        9           

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