[#4345] Make IATI results check faster
[#4345] Make IATI results check faster

Prefetch the results tree (indicators, indicator references and periods)
to make the results check faster. Ideally, we probably still don't want
to do this on each project save, but this should make things much faster
for projects with a big results framework.

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr