Fix concurrent autoupdate single requests

[bastianjoel]

resolves #4234

[reiterl]

Why is it needed to build a collection of resolved received here? I don't understand the reason for this code.

[bastianjoel]

Because without this the (single) request would not resolve resulting in guard checks getting stuck.

[Elblinator]

The reproduction from #4234 now consistently redirects you to the error?meetingId=2&error=Authorization%20Error url
-> The redirect to the error page is better than the behaviour before, but is it possible to redirect to the remaining meeting with our current setup?

The reproduction from #4281 is still resulting in the same behaviour (only step 9 now just shows a normal login page)

[bastianjoel]

The reproduction from #4234 now consistently redirects you to the error?meetingId=2&error=Authorization%20Error url
-> The redirect to the error page is better than the behaviour before, but is it possible to redirect to the remaining meeting with our current setup?

If I understand correctly this is just #4235 which is explicitly not fixed here.

The reproduction from #4281 is still resulting in the same behaviour (only step 9 now just shows a normal login page)

In that case I would suggest removing this issue from this PR.