Auto merge of #106938 - GuillaumeGomez:normalize-projection-field-ty, r=oli-obk

Add missing normalization for union fields types

Overshadows https://github.com/rust-lang/rust/pull/106808.
From the experiment https://github.com/rust-lang/rust/pull/103985.

In short, it allows to use projections as a type for union's fields.

cc `@compiler-errors`
r? `@oli-obk`

diff --cc compiler/rustc_hir_analysis/src/check/check.rs
Simple merge