[Angular] Change template story files extension .ts

[Quramy]

Issue:
Angular developers prefer TypeScript to JavaScript. It's useful that getstorybook cmd creates .ts stories files.

What I did

• [Angular] Change template story files' extension to .ts .

[NetanelBasal]

+1

[codecov]

Codecov Report

Merging #2594 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2594      +/-   ##
==========================================
+ Coverage   32.61%   32.69%   +0.08%     
==========================================
  Files         397      397              
  Lines        8855     8882      +27     
  Branches      941     1123     +182     
==========================================
+ Hits         2888     2904      +16     
+ Misses       5316     5218      -98     
- Partials      651      760     +109

Impacted Files	Coverage Δ
app/vue/src/server/utils.js	44.11% <0%> (-9.46%)	⬇️
...es__/update-addon-info/update-addon-info.output.js	0% <0%> (ø)	⬆️
addons/a11y/src/components/Report/Info.js	0% <0%> (ø)	⬆️
addons/info/src/components/Story.js	88.88% <0%> (ø)	⬆️
lib/codemod/src/transforms/move-buildin-addons.js	46.87% <0%> (ø)	⬆️
addons/jest/src/hoc/provideJestResult.js	0% <0%> (ø)	⬆️
lib/ui/src/libs/withLifecycleDecorator.js	17.14% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	54.54% <0%> (ø)	⬆️
lib/ui/src/modules/api/index.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Array.js	34.14% <0%> (ø)	⬆️
... and 54 more

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[Hypnosphi]

Make sense to me, but I'd like like to hear from people familiar with angular stuff

[igor-dv]

LGTM, but something is wrong with snapshots/angular-cli. It is looking for the index.stories.js

[ersel]

I have updated the angular snapshots so it looks for .ts files.

[NetanelBasal]

I am very familiar with Angular. I can tell that 99% of developers are working with typescript. Also, the angular-cli creates your projects with typescript files.

[Quramy]

I have updated the angular snapshots so it looks for .ts files.

Thanks @ersel , I missed it 😆