Don't try to add nested predicate to Rustdoc auto-trait ParamEnv
#80254
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Fixes #80233
We already have logic in
evaluate_predicates
that tries to addunimplemented predicates to our
ParamEnv
. Trying to add a predicatethat already holds can lead to errors later on, since projection
will prefer trait candidates from the
ParamEnv
to predicates from animpl.