Rollup merge of #149443 - reddevilmidzy:t6, r=Kivooeo

Tidying up UI tests [6/N]

> [!NOTE]
> Intermediate commits are intended to help review, but will be squashed add comment commit prior to merge.

part of rust-lang/rust#133895

removed directory  `tests/ui/trait-objects`,  `tests/ui/for`, `tests/ui/warnings`

`trait-objects` -> `traits/object`
`for` -> `for-loop-while` (except `for/issue-20605.rs` test. this relocated to `traits/dyn-iterator-deref-in-for-loop.rs`)
`warnings` -> `resolve`, `entry-point`

r? Kivooeo

Author: matthiaskrgr