Add scss for components in angular apps by default.

[igor-dv]

Issue: #2688

Looks like most of the people (I don't know if it's most, but that what I've seen recently) prefer using scss instead of css.

What I did

Changed the raw-loader to use scss

For components that use styleUrls - scss will be loaded with a raw-loader
For global imports - there will be still style-loader as before.

[amcdnl]

LGTM

[codecov]

Codecov Report

Merging #2703 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2703   +/-   ##
=======================================
  Coverage   34.36%   34.36%           
=======================================
  Files         390      390           
  Lines        8771     8771           
  Branches      922      892   -30     
=======================================
  Hits         3014     3014           
- Misses       5124     5165   +41     
+ Partials      633      592   -41

Impacted Files	Coverage Δ
...p/angular/src/server/config/webpack.config.prod.js	0% <ø> (ø)	⬆️
app/angular/src/server/config/webpack.config.js	0% <ø> (ø)	⬆️
app/vue/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/info/src/components/PropTable.js	87.23% <0%> (ø)	⬆️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	33.96% <0%> (ø)	⬆️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Date/index.js	23.52% <0%> (ø)	⬆️
addons/actions/src/lib/retrocycle.js	54.54% <0%> (ø)	⬆️
lib/components/src/table/cell.js	65.21% <0%> (ø)	⬆️
... and 61 more

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[Hypnosphi]

Is it a breaking change? It loaded .css with raw-loader before, and now it doesn't

[amcdnl]

@Hypnosphi - I believe its just for styleUrls if I'm correct.

[Hypnosphi]

Why do we need to exclude a css file is it doesn't pass the test anymore?

[igor-dv]

oops, I think I need to exclude html here.

[Hypnosphi]

its just for styleUrls if I'm correct

This PR changes styleUrls in example app. Does it mean that users will need to change it as well?

[igor-dv]

@Hypnosphi, it feels like a breaking change, but I prefer to look at it as a bug fix. Before, in order to make css work, people needed to extend webpack.config + exclude thigngs from css rules (because css didn't really work by default) + add scss. So now they maybe will need just to remove these extended webpack.config ...

[Hypnosphi]

css didn't really work by default

OK then