test: refactor cli test

[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 tests.

Motivation / Use-Case

No need for separate test cases of --hot and --no-hot for webpack 4 and webpack-5

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #3024 (0ce622c) into master (7d339d4) will increase coverage by 1.58%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3024      +/-   ##
==========================================
+ Coverage   90.64%   92.22%   +1.58%     
==========================================
  Files          37       37              
  Lines        1261     1261              
  Branches      327      327              
==========================================
+ Hits         1143     1163      +20     
+ Misses        110       93      -17     
+ Partials        8        5       -3     

Impacted Files	Coverage Δ
lib/Server.js	94.44% <0.00%> (-0.23%)	⬇️
lib/utils/routes.js	98.21% <0.00%> (+3.57%)	⬆️
lib/utils/DevServerPlugin.js	100.00% <0.00%> (+26.02%)	⬆️

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