Docs: Document RuleTester static methods

[JoshuaKGoldberg]

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Suggested Changes

@justinfagnani posted in our Discord some questions about RuleTester errors around describe and afterAll. The thread ended up noting that we don't have a docs section describing what RuleTester's static methods such as describe and it do. I think that'd be useful in an "Other Frameworks" section after Jest, Vitest, etc. That way folks using some arbitrary other framework can understand which statics they need.

Sibling issue to #8273.

Affected URL(s)

https://typescript-eslint.io/packages/rule-tester/#with-specific-frameworks