Tracking issue for release notes of #126450: Promote Mac Catalyst targets to Tier 2, and ship with rustup

[rustbot]

This issue tracks the release notes text for #126450.

Steps

• Proposed text is drafted by PR author (or team) making the noteworthy change.
• Issue is nominated for release team review of clarity for wider audience.
• Release team includes text in release notes/blog posts.

Release notes text

The responsible team for the underlying change should edit this section to replace the automatically generated link with a succinct description of what changed, drawing upon text proposed by the author (either in discussion or through direct editing).

# Compiler
- [Promote Mac Catalyst targets `aarch64-apple-ios-macabi` and `x86_64-apple-ios-macabi` to Tier 2, and ship them with rustup](https://github.com/rust-lang/rust/pull/126450)

Tip

Use the previous releases categories to help choose which one(s) to use.
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Release blog section

If the change is notable enough for inclusion in the blog post, the responsible team should add content to this section.
Otherwise leave it empty.

cc @madsmtm, @Mark-Simulacrum -- origin issue/PR authors and assignees for starting to draft text

[madsmtm]

Wording suggestion: Maybe mention the target names explicitly?

Promote Mac Catalyst targets aarch64-apple-ios-macabi and x86_64-apple-ios-macabi to Tier 2

[madsmtm]

Also, I think I would like something like the following to be added to the blog, to increase awareness of the option to use Mac Catalyst when testing:

Mac Catalyst targets are now Tier 2

Mac Catalyst is a technology by Apple that allows running iOS applications natively on the Mac. This is especially useful when testing iOS-specific code, as cargo test --target=aarch64-apple-ios-macabi --target=x86_64-apple-ios-macabi mostly just works (in contrast to the usual iOS targets, which need to be bundled using external tooling before they can be run on a native device or in the simulator).

The targets are now tier 2, and can be downloaded with rustup target add aarch64-apple-ios-macabi x86_64-apple-ios-macabi, so now is an excellent time to update your CI pipeline to test that your code also runs in iOS-like environments.

Though ultimately not up to me to decide.