Rollup merge of #110498 - kylematsuda:earlybinder-rpitit-tys, r=compiler-errors

Switch to `EarlyBinder` for `collect_return_position_impl_trait_in_trait_tys`

Part of the work to finish rust-lang/rust#105779.

This PR adds `EarlyBinder` to the return type of the `collect_return_position_impl_trait_in_trait_tys` query and removes `bound_return_position_impl_trait_in_trait_tys`.

r? `@lcnr`

Author: matthiaskrgr