[8.21] backport automatic changelog generation

Alessio Caiazzarequested to merge
backport-changelog-8-21 into 8-21-stable

What is included in this MR

Add automatic changelog generation

See merge request !484 (merged)

Why do we need this backport?

Our security release policy requires backporting a fix for 3 releases, with this backport we ensure that if we have to perform a security release today, the process will be the same for all the backports.

Edited by Alessio Caiazza

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