remove `cloud.` from frontend-hostnames

[ultraschuppi]

Description

for https://github.com/camunda/product-hub/issues/1989

When should this change go live?

• [X] 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.

[github-actions[bot]]

:wave: :robot: :white_check_mark: Looks like the changes were ported across versions, nice job! :tada:

You can read more about the versioning within our docs in our documentation guidelines.

[akeller]

Can I add a hold label to this as we are prepping for the alpha release?

[ultraschuppi]

Can I add a hold label to this as we are prepping for the alpha release?

of course!

also for reasons this is not going to happen anytime soon (months not weeks). likely was too optimistic about the flexibility of our users ;)