fix[next]: Fix size temporary size computation

[tehrengruber]

This PR fixes a bug where the size of unstructured temporary fields was wrong in certain cases. This bug surfaced while working on #1568. It took me a while to figure out why this never surfaced in validation tests anywhere:
Right now we compute temporaries for unstructured everywhere, e.g. on all vertices, etc.. What everywhere means is derived from the offset provider in _max_domain_sizes_by_location_type. The information is contained either

• explicitly if we have a connectivity with origin axis being the axis whose size we want to know. E.g. if we have a V2E connectivity then we have table.shape[0] many vertices.
• or implicitly if we have a connectivity with the neighbor axis whose size we want to know. E.g. if we have a V2E connectivity then we have at least table.max()+1 many edges. This computation was wrong.

So as long as we have also the E2V connectivity for the examples above, the implicit information is not needed / used and everything works fine. For all our test cases this is indeed the case and since computing temporaries everywhere is only a temporary solution anyway I am fine with just fixing this without increasing test coverage.

[egparedes]

LGTM

[edopao]

You need to merge main into this PR in order to skip the CI on Todi.

[edopao]

You need to merge main into this PR in order to skip the CI on Todi.

Done. I would like to get this fix merged so we can merge main into gtir later today.