chore: bump to typescript-eslint@3 and eslint@7

[SimenB]

Summary

Relates to #10177, but disables some defaults from the ban-types rule. @G-Rath is currently working on them (thanks! 🙏), but we can bump the other stuff in the meantime.

Test plan

Green CI

[G-Rath]

Yeah, I think this is the best way to go 😅

If we wanted to make those warn, we could use a local plugin that just re-exports ban-types to duplicate it under a new name.
(tbh that wouldn't be the worst solution for eslint-plugins to do as a general pattern for these sorts of rules: ship a ban-*-1 & ban-*-2 🤔)

[SimenB]

As a migrating strategy? I kinda like that idea 😀 In this case we can hopefully turn them on again pretty soon, though. Could possibly disable only per module via some more specific overrides config instead of for all files as well, not sure if it's worth the trouble or not, though.

[G-Rath]

Yeah exactly! Give me 5 and I'll whip something up in another PR (since it can be landed without this)

[SimenB]

It's 3 am here, so I'll head to bed very soon. Happy to take a look tomorrow, though 😀

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