Rollup merge of #130282 - compiler-errors:over-overflow, r=BoxyUwU

Do not report an excessive number of overflow errors for an ever-growing deref impl

Check that we don't first hit the recursion limit in `get_field_candidates_considering_privacy` before probing for methods when we have a method lookup failure and we want to see if `.field.method()` exists. We also silence overflow error messages if we're probing for methods for diagnostics.

Also renames some functions to make it clearer that they're only for diagnostics, and sprinkle some `Autoderef::silence_errors` around to silence unnecessary overflow errors that come from diagnostics.

Fixes #130224.

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