Tracking issue for release notes of #132515: Fix and undeprecate home_dir()

[rustbot]

This issue tracks the release notes text for #132515.

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).

# Libraries
- [`std::env::home_dir()` on Windows now ignores the non-standard `$HOME` environment variable](https://github.com/rust-lang/rust/pull/132515)
   It will be un-deprecated in a subsequent release.

# Compatibility Notes
- `std::env::home_dir()` has been deprecated for years, because it can give surprising results in some Windows configurations if the `HOME` environment variable is set (which is not the normal configuration on Windows). We had previously avoided changing its behavior, out of concern for compatibility with code depending on this non-standard configuration. Given how long this function has been deprecated, we're now fixing its behavior as a bugfix. A subsequent release will remove the deprecation for this function.

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Release blog section

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`std::env::home_dir()` has been deprecated for years, because it can give surprising results in some Windows configurations if the `HOME` environment variable is set (which is not the normal configuration on Windows). We had previously changed its behavior, out of concern for compatibility with code depending on this non-standard configuration. Given how long this function has been deprecated, we're now fixing its behavior as a bugfix, and the next version will undeprecate it. (We deferred undeprecating it on nightly until today's stable release, to avoid potential confusion between the fixed version on nightly and the previously unfixed version on stable.)

cc @kornelski, @jhpratt -- origin issue/PR authors and assignees for starting to draft text

[kornelski]

For release notes:

home_dir() stopped using HOME environment variable on Windows, which was a non-standard behavior. It will be undeprecated in the next release.

[cuviper]

We had previously changed its behavior, out of concern for compatibility

Is this meant to be "previously avoided changing its behavior"?