refactor: make each tsconfig explicitly declare module and include/exclude

[Josh-Cena]

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• If this is a code change: I have written unit tests and/or added dogfooding pages to fully verify the new behavior.
• If this is a new API or substantial change: the PR has an accompanying issue (closes #0000) and the maintainers have approved on my working plan.

Motivation

Another round of effort to make our TS setup more approachable.

This time, the root tsconfig.json doesn't control emit options anymore, in particular, module. This means each project needs to explicitly declare itself as ESM or CJS, which will help with progressive ESM migration (#6520).

In addition, the root tsconfig also doesn't exclude test files now. VS Code still doesn't pick up any tsconfig for test files because the nearest one excludes them. However, we are now at least able to run yarn tsc at the root and get all test files' type-checking errors, which will help in the future if we are to use TS-ESLint's type-aware linting rules, or simply if we want to integrate type-checking test files into the CI.

Test Plan

Test links

Deploy preview: https://deploy-preview-_____--docusaurus-2.netlify.app/

Related issues/PRs

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟠 88	🟢 100	🟢 100	🟢 100	🟢 90	Report
/docs/installation	🟢 91	🟢 99	🟢 100	🟢 100	🟢 90	Report

[github-actions]

Size Change: 0 B

Total Size: 796 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	52.3 kB
website/build/assets/css/styles.********.css	106 kB
website/build/assets/js/main.********.js	599 kB
website/build/index.html	38.9 kB

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