Auto merge of #94108 - compiler-errors:just-confirmation-normalization, r=jackh726

Normalize obligation and expected trait_refs in confirm_poly_trait_refs

Consolidate normalization the obligation and expected trait refs in `confirm_poly_trait_refs`. Also, _always_ normalize these trait refs -- we were already normalizing the obligation trait ref when confirming closure and generator candidates, but this does it for fn pointer confirmation as well.

This presumably does more work in the case that the obligation's trait ref is already normalized, but we can see from the perf runs in #94070, it actually (paradoxically, perhaps) improves performance when paired with logic that normalizes projections in fulfillment loop.

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