detail pages fails too quickly

[MortenHofft]

The dataset page will show a 500 error even if it is just the occurrence query that fails.
It would be nice to just show what we can in those cases and notify the user about the partial page render

same goes for CollectionSummaryMetrics on collection detail page.

We should go through all pages where we throwAllErrors: true,
and revisit if that is really the best approach. In cases where it isn't essential data we should fail gracefully and inform the user about failing backend requests instead. Possibly retry a single time after a few seconds.

Ideally we have a general approach for how to decide when something is seconday vs essential.
And a general approach for how we notify users.