fix: normalize projection after discarding free BoundVars in RPIT
#13750
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Fixes #13307
When we lower the return type of a function, it may contain free
BoundVars inOpaqueType's substitution, which would cause panic during canonicalization as part of projection normalization. ThoseBoundVars are irrelevant in this context and will be discarded, and we should defer projection normalization until then.