docs: Update release management for Xena process

At the Kolla Xena PTG [1] we discussed making some changes to the
release process, as well as improving documentation around some of the
less well documented steps. Since then, a draft proposal was circulated
[2], and discussed in IRC meetings [3].

This change updates the release management documentation based on the
agreed process. It also includes Kayobe release steps which were
previously documented separately [4].

[1] https://etherpad.opendev.org/p/kolla-xena-ptg
[2] https://etherpad.opendev.org/p/kolla-release-process-draft
[3] https://meetings.opendev.org/meetings/kolla/2021/kolla.2021-06-02-15.02.log.html#l-81
[4] https://docs.openstack.org/kayobe/latest/contributor/releases.html

Change-Id: Ib041d46a2bdbfc6d4b861465a48ba7c5f202d9a5

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