Improve how forms can be shared for review

## Description

• Provide a better way to enable multiple collaborators (including senior management and external stakeholders) to review forms.

## Context

Many people publish "test" or "draft" forms to be able to share them with colleagues for review and approval, because it's simpler to send a URL that looks like the real finished product than to share the JSON for reupload with only people who have accounts.

We have an interim intervention to ask if a form is being published for sharing/approval purpose to help us triage these:

## Related Support tickets and feedback

https://cds-snc.freshdesk.com/a/tickets/28152

https://gcdigital.slack.com/archives/C09CM76GCS0/p1785850056468909
> Not well suited to get ADM approval /signature

## Work done so far

- [August 2023 Portage](https://miro.com/app/board/uXjVMrBe03Y=/?share_link_id=63391143790)
- [February 2024 Figma](https://www.figma.com/file/yQmBXLZ07qFElbRE89kdal/GC-Forms---Preview-and-Share?type=design&node-id=3067-23046&mode=design&t=UcD90pbmunx91mXm-4)
- https://github.com/cds-snc/platform-forms-client/issues/1732