rework get-sequences endpoint to return metadata

[TobiasKampmann]

The first approach shows some shortcomings.

1. the warning icon should be yellow, but due lazy loading thats not possible when only status infos are available
2. the get-data-to-edit endpoint excludes RECEIVED and IN_PROCESSING statuses.

Solution:

Send data directly with the get-sequences call.

[chaoran-chen]

@theosanderson, @fengelniederhammer, do you know whether this is still relevant?

[fengelniederhammer]

It might be, yes. We're still fetching every individual entry after intially getting all sequences for the review page. But currently, I don't see it as a big problem, since it works.

[fhennig]

We tried to refactor this, but in our initial implementation we realized that sequence data was also sent along, which was too much data to query every 10 seconds (#3189).