[DOCS] Adds the 8.0.0-beta1 release notes

[KOTungseth]

Summary

Adds the release notes for the 8.0.0-beta1 release.

[elasticmachine]

Pinging @elastic/kibana-docs (Team:Docs)

[thomasneirynck]

maps release notes lgtm, thanks!

[cjcenizal]

Stack Management notes LGTM. Thanks @KOTungseth !

[jportner]

Sorry for the late review on behalf of Platform Security.
All of our breaking changes in 8.0 are listed here: #111160
(you can ignore the ones that are marked as "Future", we have deprecated those but they are not breaking in 8.0)

I see in these 8.0.0-beta1 release notes you noted:

• Remove legacy audit logging
• Prevent disabling the security plugin (in "Removes xpack.security.enabled setting")
• Prevent disabling the spaces plugin (in "Removes enabled settings from plugins")
• Prevent disabling the encryptedSavedObjects plugin (in "Removes enabled settings from plugins")
• Include ML feature in base privileges

I see in the 8.0.0-alpha2 release notes you noted:

• Remove kibana_dashboard_only_user role in favor of Kibana feature privileges

I did not see any mention of:

• Change Cases sub-feature to be a top-level feature (though maybe this should be in the "Elastic Security Solution Release Notes" instead?)

Also, we had a release note for "Add defaults for xpack.security.session.{lifespan,idleTimeout}" in 8.0.0-alpha1, but that has now changed a bit. The new default for xpack.security.session.idleTimeout is now 8h instead of 1h. Should we updated it in the 8.0.0-beta1 release notes?

[jportner]

We already have a blanket section above titled "Removes enabled settings from plugins".

On one hand I understand this is a bit different than the other plugins that can be disabled.
However, I'm not really sure that we need this separate release note for the Security plugin.

[KOTungseth]

@jportner Removes xpack.security.enabled setting is documented in a separate section is because the work was completed in #111681, and Removes enabled settings from plugins was completed in #113495. I can combine them if needed.

[jportner]

Yeah, we only completed it in a separate PR because we had some complex test changes to make as a result.

I'd personally lean towards a single section since that's more concise and the release notes are already massive.

[KOTungseth]

Done! Can you take a final look to make sure it still makes sense?

[jportner]

Looks good

[KOTungseth]

@jportner

I did not see any mention of:

• Change Cases sub-feature to be a top-level feature (though maybe this should be in the "Elastic Security Solution Release Notes" instead?)

This should be documented in the Elastic Security Solution Release Notes.

Also, we had a release note for "Add defaults for xpack.security.session.{lifespan,idleTimeout}" in 8.0.0-alpha1, but that has now changed a bit. The new default for xpack.security.session.idleTimeout is now 8h instead of 1h. Should we updated it in the 8.0.0-beta1 release notes?

I can make this change in a separate PR.

[kibanamachine]

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cc @KOTungseth