Rollup merge of #62849 - davidtwco:prohibit-inheriting-lifetimes, r=nikomatsakis

typeck: Prohibit RPIT types that inherit lifetimes

Part of #61949.

This PR prohibits return position `impl Trait` types that "inherit
lifetimes" from the parent scope. The intent is to forbid cases that are
challenging until they can be addressed properly.

cc @nikomatsakis