4.1.0 release notes: prepare for 4.1.0 GA

(cherry picked from commit cb4676d)

Conflicts:
	release-notes/4.1.0.md

4.0.9 release notes

(cherry picked from commit 97b98c1)

Merge pull request #13736 from rabbitmq/mergify/bp/v4.1.x/pr-13735

Ra 2.16.8 (backport #13735)

Update 4.0.8 release notes

[skip ci]

(cherry picked from commit 2af6181)

4.0.8 release notes fixes

(cherry picked from commit 45f0f1c)

Extend the idea in #13512 to a few more tabs

(cherry picked from commit f2da1b5)

4.0.7 release notes

(cherry picked from commit 9857128)

4.0.6 release notes: a missing link

(cherry picked from commit 631a205)

Update Mergify for v4.1.x

Pair: @the-mikedavis
(cherry picked from commit 1af6c4d)

Merge pull request #12946 from rabbitmq/mergify/bp/v4.0.x/pr-12945

4.0.5 release notes (backport #12945)