feat(sass): add export activity

[ColRad]

Description

Documentation changes for the Export Activity feature in SaaS Console.
https://github.com/camunda/product-hub/issues/2530

When should this change go live?

• 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.

[mesellings]

Lgtm - I've updated the screenshot and reworded/restructured the content a bit. 👍 🚀

[mesellings]

@ColRad Should this be updated for versions 8.5, 8.4 etc?

[ultraschuppi]

@ColRad Should this be updated for versions 8.5, 8.4 etc?

for all features that get built we usually only add them to the current (8.6) stream + next - so i think we are good here.

thanks for updating the screenshots :)