ref(dev): Split up top-level yarn clean script (#5095)

This splits the repo-level `yarn clean` command, which currently leaves the repo in a broken state (build artifacts deleted, and unable to be rebuilt because package-level `node_modules` folders - though not the top `node_modules` folder - have also been deleted), into a number of new, more focused commands. In the `clean:deps` command, it now deletes _all_ `node_modules` folders (repo- and package-level) and reinstalls dependencies, so that the repo is no longer broken after running it. The new commands:

```
// Meant to be a useful default for day-to-day use
"clean": "run-p clean:build clean:caches"

// Runs all package-level clean commands, which delete build and testing artifacts
"clean:build": "lerna run --parallel clean"

// TODO: Are there other caches we should add here?
"clean:caches": "yarn rimraf eslintcache && yarn jest --clearCache"

// Nuke all node modules and reinstall dependencies
"clean:deps": "lerna clean --yes && rm -rf node_modules && yarn"

// insert "Clean all the things!" meme here
"clean:all": "run-p clean:build clean:caches clean:deps"
```

Author: lobsterkatie

package.json

@@ -12,7 +12,11 @@
     "build:types:watch": "ts-node scripts/build-types-watch.ts",
     "build:npm": "lerna run --parallel build:npm",
     "circularDepCheck": "lerna run --parallel circularDepCheck",
-    "clean": "lerna run --parallel clean && lerna clean --yes && yarn rimraf eslintcache",
+    "clean": "run-p clean:build clean:caches",
+    "clean:build": "lerna run --parallel clean",
+    "clean:caches": "yarn rimraf eslintcache && yarn jest --clearCache",
+    "clean:deps": "lerna clean --yes && rm -rf node_modules && yarn",
+    "clean:all": "run-p clean:build clean:caches clean:deps",
     "codecov": "codecov",
     "fix": "lerna run --parallel fix",
     "link:yarn": "lerna exec --parallel yarn link",