update collection max_size to include limits due to ObjectID

[m-fila]

BEGINRELEASENOTES

• Update max_size reported by collections to include limit due to ObjectID index type

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Collections probably shouldn't have more elements than maximal int as otherwise ObjectID index will overflow. For subset collections it's fine as their elements have ObjectID referring to other non-subset collections. It's also fine for UserDataCollection since it isn't using ObjectID

As far as I can say max_size was added as part of "Container" interface and as far as I can say isn't actively used by anything in the stack. But if we can report a more realistic number then why not

[tmadlener]

Looks reasonable to me. CI is currently suffering from some EOS problems most likely as the downloads for the test files are failing. Maybe we should consider caching them (if at all possible).