Auto merge of #124562 - dpaoliello:mingwserver2022, r=Mark-Simulacrum

Use Server 2022 in CI for mingw jobs

From my [previous testing](rust-lang/rust#92948 (comment)), there is nothing blocking using Server 2022 for the Windows MinGW jobs.

This change:
* Adds new `os` entries for Server 2022.
* Renamed the Server 2019 `os` entries (as we'll be removing these over time).
* Moves the mingw jobs to Server 2022 and leaves the msvc jobs on Server 2019.

Partially fixes #92948

Author: bors