wip: Seq page revocation

[theosanderson]

Summary

• Add a revocation button to the bottom of the sequence details page if the sequence is from one of my groups
• Make it redirect to review page
• Make review page display revocations awaiting approval
• Make approval endpoint accept revocations awaiting approval
• Bring in react-toastify and use it to display error messages here: IMO we should deprecate managed error feedback, which requires us to hold state. We can use react-toastify with a single line.

Screenshot

PR Checklist

• All necessary documentation has been adapted.
• The implemented feature is covered by an appropriate test.

[chaoran-chen]

I think that it is nice to be able to perform "submitter actions" from the sequence detail pages. However, I would introduce a separate visual area to make it clear that it is only visible to oneself due to the submitter status.

A possible inspiration could further be Slack that displays an "Only visible to you" message:

[theosanderson]

Agreed, the design is WIP

[corneliusroemer]

Converted to draft (wip in title)