Remove most pnpm hoisting, fix phantom deps (#24096)

We've long had pnpm's public hoisting disabled, but it also privately
hoists everything into `node_modules/.pnpm/node_modules/` for
compatibility with packages that have undeclared dependencies. Let's
disable most of that private hoisting and see what turns up.

Changes of note:

* We still hoist a bunch of eslint plugins (and one prettier plugin) as
  untangling that mess seems like enough work to put off for later.
* Only a few upstream packages have bugs that need working around:
  * `@mdx-js/loader`: mdx-js/mdx#2019
  * `@automattic/components`: Missing dep on `@wordpress/base-styles`.
	And the next version will probably be unusable for us due to added
	`i18n-calypso`.
  * `@automattic/popup-monitor`: Missing dep on `events`.
  * markdown-it`: Missing dep on `punycode`.
    markdown-it/markdown-it#230
  * `@samverschueren/stream-to-observable`: Outdated dep on `any-observable`.
    SamVerschueren/stream-to-observable#9
    Hacking around that should also fix p1649254510834369-slack-CBG1CP4EN.
  * `git-node-fs`: Missing peer dep on `js-git`.
    creationix/git-node-fs#8
* `fetch-mock`'s peer dep on `node-fetch` is optional, but only because
  they also allow running in-browser. It's required for node.
* Added `webpack-cli` alongside `webpack` everywhere to make sure
  p1650571211251179-slack-CBG1CP4EN is fixed. Dropped Webpack entirely
  from Boost instead though, they don't use it.
* Had our webpack-config package point to its own copy of
  `@babel/runtime` instead of making that a peer dep.
* Jetpack's extensions tests use a ton of `@wordpress/` packages that
  weren't being directly depended on.

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/2234009376

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.1.12-alpha] - unreleased
+
+This is an alpha version! The changes listed here are not final.
+
+### Added
+- Add missing JavaScript dependencies.
+
 ## [2.1.11] - 2022-04-26
 ### Changed
 - Updated package dependencies.
@@ -205,6 +212,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Lazy Images: Move into a package
 
+[2.1.12-alpha]: https://github.com/Automattic/jetpack-lazy-images/compare/v2.1.11...v2.1.12-alpha
 [2.1.11]: https://github.com/Automattic/jetpack-lazy-images/compare/v2.1.10...v2.1.11
 [2.1.10]: https://github.com/Automattic/jetpack-lazy-images/compare/v2.1.9...v2.1.10
 [2.1.9]: https://github.com/Automattic/jetpack-lazy-images/compare/v2.1.8...v2.1.9

package.json

@@ -25,8 +25,10 @@
 	},
 	"devDependencies": {
 		"@automattic/jetpack-webpack-config": "^1.1",
+		"@wordpress/browserslist-config": "4.1.2",
 		"copy-webpack-plugin": "10.2.0",
 		"intersection-observer": "0.12.0",
-		"webpack": "5.65.0"
+		"webpack": "5.65.0",
+		"webpack-cli": "4.9.1"
 	}
 }