chore(new): prevent generation of .gitignore when using --skip-git

[Brocco]

Generating a new project when using --skip-git a .gitignore file is still created, this PR will prevent that file from being generated hence reducing app clutter.

[hansl]

LGTM, thanks!

[ADTC]

If this is by design, this is a very sad design decision. I hope the counterargument for creating the file as shown in #8638 makes sense. Or we can at least consider adding a --gitignore flag to create the file?

[Executus]

I agree with ADTC, there should be a flag to create the gitignore file. Anyone who uses VSTS will find this design troublesome, as git projects must be initialised in VSTS first, hence you don't want to init a git repo on the client, but still want the gitignore.

[arturhun]

It is a very bad design decision, without giving any option to work it around.

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