Document Zeebe APIs for dual-region operations

[deepthidevaki]

Description

Related to camunda/camunda#16126

This PR documents

1. The new features added to cluster scaling API for supporting the dual-region deployment
2. The new API for enabling and disabling the exporter

How to use these APIs are already documented in #4205

When should this change go live?

With the next 8.6 alpha or 8.6 minor which ever is the earliest.

• This is a bug fix, security concern, or something that needs urgent release support.
• This is already available but undocumented and should be released within a week.
• This on a specific schedule and the assignee will coordinate a release with the DevEx team. (apply hold label or convert to draft PR)
• This is part of a scheduled alpha or minor. (apply alpha or minor label)
• There is no urgency with this change and can be released at any time.

PR Checklist

• My changes are for an already released minor and are in /versioned_docs directory.
• My changes are for the next minor and are in /docs directory (aka /next/).

• My changes require an Engineering review, and I've assigned the Engineering DRI or delegate.
• My changes require a technical writer review, and I've assigned @camunda/tech-writers as a reviewer.

[github-actions]

👋 🤖 🤔 Hello! Did you make your changes in all the right places?

These files were changed only in docs/. You might want to duplicate these changes in versioned_docs/version-8.5/.

• docs/self-managed/zeebe-deployment/operations/cluster-scaling.md
• docs/self-managed/zeebe-deployment/operations/management-api.md

You may have done this intentionally, but we wanted to point it out in case you didn't. You can read more about the versioning within our docs in our documentation guidelines.

[mesellings]

@deepthidevaki Which alpha/release is this for please?

[deepthidevaki]

@deepthidevaki Which alpha/release is this for please?

If possible, include in the next 8.6 alpha (next week). Otherwise, in 8.6 minor.

[mesellings]

@deepthidevaki Which alpha/release is this for please?

If possible, include in the next 8.6 alpha (next week). Otherwise, in 8.6 minor.

Are you able to add the relevant label(s) for this please?

[conceptualshark]

I've made a few edits for grammar and style, and rearranged a sentence or to for clarity - would you mind making sure I haven't lost any of the technical requirements in doing so? Otherwise, this is now good from me. 👍

[deepthidevaki]

Thanks @conceptualshark for the edits. Looks good to me. I will merge this PR.