docs(self-managed): camunda helm chart v8.3 updates

[hamza-m-masood]

Description

Fixes: camunda/camunda-platform-helm#898

Topics based on v8.3 release checklist:

New features:

• initContainers
• Multi-tenancy support.

Changes:

• Elasticsearch 8.
• Keycloak 22.
  • Add note about PostgreSQL chart warning that shows when the template is rendered.
• WebModeler database config.

When should this change go live?

• This change is not yet live and should not be merged until {ADD_DATE} (apply hold label or convert to draft PR)?
• There is no urgency with this change.
• This change or page is part of a marketing blog, conference talk, or something else on a schedule.
• This functionality is already available but undocumented.
• This is a bug fix or security concern.

PR Checklist

• I have added changes to the relevant /versioned_docs directory, or they are not for an already released version.
• I have added changes to the main /docs directory (aka /next/), or they are not for future versions.
• My changes require an Engineering review, and I've assigned an engineering manager or tech lead as a reviewer, or my changes do not require an Engineering review.
• My changes require a technical writer review, and I've assigned @christinaausley as a reviewer, or my changes do not require a technical writer review.

[akeller]

I just cleaned this PR up, including changes to the update guide for ES8. Can you look and see if there is any linking or consolidation you suggest?

[christinaausley]

I just cleaned this PR up, including changes to the update guide for ES8. Can you look and see if there is any linking or consolidation you suggest?

@akeller is this directed to me? Or, are you just looking for general review here?

[akeller]

My comment was directed at @HamzaMasood1, but we need a general review here, too @christinaausley. You might want to hold off until @HamzaMasood1 responds.

[aabouzaid]

Let's use this PR for all changes related to the upgrade from v8.2 to v8.3

[aabouzaid]

I will add other components related to v8.3 upgrade (e.g. Keycloak).

[CLAassistant]

All committers have signed the CLA.

[christinaausley]

Hi @HamzaMasood1 -- please sign the CLA 👍

[christinaausley]

@aabouzaid @HamzaMasood1 -- are there additional changes to make here before release tomorrow, or can this be merged in?

[hamza-m-masood]

@christinaausley I am adding in more details to the ES8 upgrade guide. You will see my changes very soon.

[aabouzaid]

@christinaausley I'm working on some changes here. When is the docs release time?

[christinaausley]

@christinaausley I'm working on some changes here. When is the docs release time?

@pepopowitz Is going to get started cutting the version this afternoon on central time. Just let me know when you're finished up @aabouzaid 👍

[aabouzaid]

@christinaausley I'm done, hope it's not too late 😅 (I thought that the docs release cut will happen tomorrow).

[christinaausley]

Good grief -- nice work @aabouzaid! I'll get this merged in.

adjusted in commits