Don't build `ParamEnv` and do trait solving in `ItemCtxt`s when lowering IATs#140247

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BoxyUwU wants to merge 1 commit intorust-lang:masterfrom

BoxyUwU:iats_no_query_cycles

Commits on Apr 29, 2025

Don't build `ParamEnv` and do trait solving in `ItemCtxt`s
BoxyUwU
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