fix(serve): supplying help or version as an arg should throw

[jamesgeorge007]

What kind of change does this PR introduce?
bugfix

Did you add tests for your changes?
yup

If relevant, did you update the documentation?
N/A

Summary

• webpack-cli serve help should throw an error.
• Added a test case to ensure that serve respects --no-color flag.

Does this PR introduce a breaking change?
Nope

Other information
N/A

[anshumanv]

It's really confusing and misleading. I think we should only support --help & --version.
Hence we won't have to support webpack serve help.
webpack serve --help is sufficient.

+1 only creates confusion, /cc @evilebottnawi

[alexander-akait]

Good question, I don't have the strong opinion here, but git supports

git help fetch
git fetch --help

[anshumanv]

Good question, I don't have the strong opinion here, but git supports

In this case fetch is the arg for the help command => only 1 command, we are supporting serve help too which is actually misleading

[alexander-akait]

Yes we should remove webpack serve help supporting

[anshumanv]

@jamesgeorge007 can you update the PR to limit command count to 1?

[jamesgeorge007]

Yes we should remove webpack serve help supporting

Couldn't agree more.