Fixes #18056

This updates to the latest version of the `@ampproject/toolbox-optimizer` which contains updates for dependencies to remove the warnings on install from `npm`

x-ref: https://github.com/vercel/next.js/pull/18994
Closes: https://github.com/vercel/next.js/issues/17416

This fixes compatibility with React 17 and `styled-jsx`.

Fixes #19242

We accidentally regressed back in 9.5 and dropped support for inline CSS comments. PostCSS always parses these as pass-through (and not a syntax error), which can cause problems when minifying.

Browsers do a similar thing and ignore the comments.

To ensure we generate valid CSS, this adds support for stripping the CSS comments from the build.

--- 

Fixes #15589
Closes #17130

In working with @devknoll on https://github.com/vercel/next.js/pull/17770 we thought it would be a good idea to update to the latest minor version from 1.2.20 -> 1.4.9 based on some bug fixes in these minor releases. I would like to separate this out to simplify the growing changeset in https://github.com/vercel/next.js/pull/17770, where we need to use `node-html-parser` to parse HTML for custom react components.

The linked changeset above will take some time and there are some [useful bug fixes](https://github.com/taoqf/node-html-parser/commits/master) and features in this minor release we could benefit from anyway. Namely:

- add nextSibling, nextElementSibling
- missing node tag
- `<style>` tag is not parsed correctly

Also I think it's a good idea to separate this out for testing.

Fixes #18518

Updates to the latest version of `chokidar`

x-ref: https://github.com/vercel/next.js/issues/17416

`node-sass` v5 introduced support for Node.js v15, which is not supported by v4. However, Next.js currently errors with
```
Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.
```
when attempting to build with `node-sass` 5.0.0. This error comes from `sass-loader`. They have recently released version 10.0.5 which supports `node-sass` 5.0.0 (PR <https://github.com/webpack-contrib/sass-loader/pull/899>, release <https://github.com/webpack-contrib/sass-loader/releases/tag/v10.0.5>).

This makes sure we don't use es6 syntax when compiling the `web-vitals` package with `ncc` since that breaks IE11 compatibility 

x-ref: https://github.com/vercel/ncc/pull/614

Fixes #17066

This upgrades to ncc@0.25.0 and fixes the previous bugs including:

* ncc not referenced correctly in build
* Babel type errors
* node-fetch, etag, chalk and raw-body dependencies not building with ncc - these have been "un-ncc'd" for now. As they are relatively small dependencies, this doesn't seem too much of an issue and we can follow up in the tracking ncc issue at https://github.com/vercel/ncc/issues/612.
* `yarn dev` issues

Took a lot of bisecting, but the overall diff isn't too bad here in the end.