test: compress option

[alexander-akait]

• 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?

yep

Motivation / Use-Case

Avoid skip test

Breaking Changes

No

Additional Info

/cc @hiroppy I think we should enable compress by default in next major for better DX, 99% developers set it to true

[alexander-akait]

Added to https://github.com/webpack/webpack-dev-server/projects/1

[hiroppy]

@evilebottnawi I want to know how much the build speed, etc. will be affected if enabling compress. (if we make compress a default)

[hiroppy]

Thanks!!