Rust: Add change note for Rust GA.

[geoffw0]

Add change note for Rust GA.

I don't know if the docs team have plans or want to say more - but I want to be sure we say it.

[Copilot]

Pull Request Overview

This PR adds a change note to announce that Rust analysis has reached General Availability (GA) status.

• Adds a change note dated 2025-10-07 announcing Rust GA

[mchammer01]

This LGTM, however we're still mentioning that Rust support is in private preview in the GitHub docs. See this article as an example.
cc: @felicitymay - do we have a docs-content issue for the GA release of Rust support for CodeQL?

[geoffw0]

Yes, I have mentioned both of you in one of the internal tracking issues.

[geoffw0]

I don't know if the docs team have plans or want to say more

I realize now I was being a bit vague when I said this. I meant to say: I don't know if the docs team have plans to write a more detailed release note (specifically). Sorry for the confusion.

[felicitymay]

I don't know if the docs team have plans to write a more detailed release note (specifically).

Good question. PMs write release notes. I think this is normally on the releases issue.