fix(@angular/cli): Generating component considers default style ext

[AhsanAyaz]

Fixes #7624, #7644, #7647, #7708, #7715, #7719, #7721 & #7522

[AhsanAyaz]

@filipesilva , @Brocco , @hansl , can you please review this? I think I fixed #7522 too with this.
This would probably avoid anyone else to fix the same stuff.

[avatsaev]

Are there any unit tests for this?

[AhsanAyaz]

@avatsaev Added unit test for the use case. Though I do need to discuss about use cases where we want to do the setupProject based on some extra parameters.
For instance right now all tests have this setup ng(['new', 'foo', '--skip-install'] in this file.
What if I need project set up with ng(['new', 'foo', '--skip-install', '--style', 'scss'] etc for a particular test or a suite.
Gonna create an issue probably for this.

[avatsaev]

@AhsanAyaz that's great! Just be aware there is a commit message format, "Added unit-test" probably won't pass, must be something like "test (generate): add unit tests for styles extension"

[AhsanAyaz]

@avatsaev Yeah watched the build failing. Really hurts. lol
Fixing it :)

[AhsanAyaz]

@Brocco thanks for reviewing earlier.
I added the unit test. And the checks seem to be passing. You can re-review when you have some time. Thanks.

[musmanadil]

Awesome!

[grapgrap]

Awesome! Can i meet this at next version release?

[ninrod]

Hi, in what version was this landed?

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