Auto merge of #87867 - bjorn3:unique_type_id_interner, r=wesleywiser

Use a separate interner type for UniqueTypeId

Using symbol::Interner makes it very easy to mixup UniqueTypeId symbols
with the global interner. In fact the Debug implementation of
UniqueTypeId did exactly this.

Using a separate interner type also avoids prefilling the interner with
unused symbols and allow for optimizing the symbol interner for parallel
access without negatively affecting the single threaded module codegen.

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