chore: GitHub Actions cancel-in-progress

[slorber]

Motivation

Save CI resources for consecutive commits

Inspired by nodejs/node#42017

Doc: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-only-cancel-in-progress-jobs-or-runs-for-the-current-workflow

Have you read the Contributing Guidelines on pull requests?

yes

Test Plan

CI after merging?

[netlify]

✅ [V2]

Name	Link
🔨 Latest commit	a2c332e
🔍 Latest deploy log	https://app.netlify.com/sites/docusaurus-2/deploys/62618f99634fdf0009e98a2f
😎 Deploy Preview	https://deploy-preview-7224--docusaurus-2.netlify.app
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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	62
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-7224--docusaurus-2.netlify.app/

[github-actions]

Size Change: 0 B

Total Size: 801 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	50 kB
website/build/assets/css/styles.********.css	107 kB
website/build/assets/js/main.********.js	606 kB
website/build/index.html	38.8 kB

_{compressed-size-action}

[Josh-Cena]

For unit tests it may have adverse effects but I can't immediately think of one. (e.g. if we want to know the CI status of every commit)

[slorber]

Let's add this for now and we'll tweak if needed