ci: fix puppeteer flakiness

[snitin315]

• 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?

refactor test

Motivation / Use-Case

Fix #3964

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Merging #3999 (5f20ee9) into master (6d060ed) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3999   +/-   ##
=======================================
  Coverage   92.60%   92.60%           
=======================================
  Files          14       14           
  Lines        1406     1406           
  Branches      516      516           
=======================================
  Hits         1302     1302           
  Misses         96       96           
  Partials        8        8           

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[snitin315]

Three consecutive attempts were successful. I think we can merge and see it in action.

https://github.com/webpack/webpack-dev-server/actions/runs/1410331816/attempts/1
https://github.com/webpack/webpack-dev-server/actions/runs/1410331816/attempts/2
https://github.com/webpack/webpack-dev-server/actions/runs/1410331816/attempts/3