[release] Remove changelog file

https://v8.dev/blog/tags/release is the new ChangeLog!

No-Try: true
Bug: v8:10010
Change-Id: I6a0a8a893dfa29607ba2431daeea8ad1b11e2405
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1940148Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65201}