Update infra

[NullVoxPopuli]

You will want to review commit by commit

Some commits are lint:fix-only, so those can be skipped.
The main things no note that changed are:

• import sort order is enforced
• there are more linebreaks to enhance scannability.

Note on the lint package:

This is based off getting compatibility with the future of eslint, which is overrides only, and inline with the "one lint config" approach, documented here: embroider-build/addon-blueprint#71 (comment)
the lint package used will likely soon emit config to demonstrate how this works.

Here are docs on eslint and their new config format: https://eslint.org/docs/latest/use/configure/configuration-files-new
In fact, the way the new docs say to share configs, is exactly what I'm proposing here in the above issue on the v2 addon blueprint 🎉 https://eslint.org/docs/latest/use/configure/configuration-files-new#using-predefined-configurations

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Why did this happen?

A bit of a cascade from adding new project, ember-scoped-css-compat to this PR: #46
It pulls in newer lint dependencies, which due to how pnpm hoists eslint and prettier dependencies (because eslint and prettier do dirty things with dep expectations) (yarn style) -- eslint 7 and eslint 8 are not safely usable in the same monorepo together (not easily).
It was far quicker for me to upgrade everything to eslint 8 and use the latest style of linting (also splitting prettier out to its own command).

This can later be orchestrated via turbo, for aggressive caching.

Since I'm splitting up #46,

• the next PR will be to add the compat addon
• after that will be the embroider fix

[alexspeller]

LGTM