Rollup merge of #143301 - Kivooeo:tf26, r=tgross35

`tests/ui`: A New Order [26/N]

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

Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.

r? ````@tgross35````

Author: matthiaskrgr