Rollup merge of #131702 - compiler-errors:method-lookup-trait-warning, r=jieyouxu

Suppress import errors for traits that couldve applied for method lookup error

Self-explanatory. I hit this quite often when refactoring in rustc, so even though this isn't really showing up as significant in the UI test suite, it probably will matter more for multi-module projects.

Author: matthiaskrgr