Revamp the fulfillment cache tracking to only cache trait-refs, which

was the major use-case, and to update the dep-graph. Other kinds of
predicates are now excluded from the cache because there is no easy way
to make a good dep-graph node for them, and because they are not
believed to be that useful. :)

Fixes #30741. (However, the test still gives wrong result for trans,
for an independent reason which is fixed in the next commit.)

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