fix: install deps for new project via Yarn on Windows properly

[lex111]

Motivation

Fix #5466

Currently after #5233 merge dependencies are not install when initializing of new project via Yarn on Windows. This is probably because FORCE_COLOR environment variable is set in command itself, but should be set in env object as second parameter in shell.exec call.
However just in case I use supports-color to make sure that terminal supports colorized output.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Try initialize new Docusaurus project on Windows with Yarn using Command Prompt or Git Bash locally.

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

[netlify]

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	82
🟢 Accessibility	98
🟢 Best practices	100
🟢 SEO	100
🟢 PWA	95

Lighthouse ran on https://deploy-preview-5490--docusaurus-2.netlify.app/

[github-actions]

Size Change: -6 B (0%)

Total Size: 826 kB

ℹ️ View Unchanged

Filename	Size	Change
website/.docusaurus/globalData.json	36.7 kB	0 B
website/build/assets/css/styles.********.css	93.9 kB	0 B
website/build/assets/js/main.********.js	414 kB	0 B
website/build/blog/2017/12/14/introducing-docusaurus/index.html	67 kB	0 B
website/build/blog/index.html	38.1 kB	0 B
website/build/docs/index.html	44.6 kB	-3 B (0%)
website/build/docs/installation/index.html	52.8 kB	-3 B (0%)
website/build/index.html	30.8 kB	0 B
website/build/tests/docs/index.html	25.4 kB	0 B
website/build/tests/docs/standalone/index.html	23 kB	0 B

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[slorber]

LGTM, but not really sure how to test this 😅

@Josh-Cena any opinion before merge?

[Josh-Cena]

The change looks good to me, at least there won't be further regression... Maybe we should also run E2E tests on Windows?

[slorber]

Going to merge then and we'll see on canary

Maybe we should also run E2E tests on Windows?

Yes makes sense, will add a call to init + start there. I'll probably skip the Verdaccio part though, it's a bit heavy and would lead to a long test (windows tests are already slower...)