[Chapel Merge] CHANGES.md updates for Chapel 2.8

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Branch: refs/heads/main
Revision: 7450833c1552e8f51642c7bbcc1929bd7071826b
Author: bradcray
Link: CHANGES.md updates for Chapel 2.8 by bradcray · Pull Request #28449 · chapel-lang/chapel · GitHub
Log Message:
CHANGES.md updates for Chapel 2.8 (#28449)

[reviewed by @DanilaFe]

This is the list of updates that we've made for the Chapel 2.8 release.
Thanks everyone for all the hard work!

Compare: Comparing ee4a0c3e4cb85997e68473c9a72530498caea507...e2d5f1d9b8f6eac9191ccf220833fc3a5c360da8 · chapel-lang/chapel · GitHub

Diff:
M CHANGES.md
https://github.com/chapel-lang/chapel/pull/28449.diff