Include active sponsor

[NikitaAvvakumov]

• add display of current sponsor, if any, to orphans index view & exported CSV
• fix N+1 queries
• refactor query in OrphansController#index

This PR breaks a number of unit tests, mostly controller & view. All are low-level tests that are very fragile as they are tied too closely to the implementation detail. Rather than fixing them, I am inclined to either improve them or to drop them entirely. Would prefer to handle that separately in order to deliver the feature to the client ASAP

[NikitaAvvakumov]

@b264 Fixed the tests in place.

Going forward, refactoring and/or removing many of these should be a priority to avoid ~doubling the workload for each change or new feature. Right now, I'm tempted to just rm -rf spec/controllers. Back in the day, we drank way too much textbook Kool-Aid and chased after complete coverage instead of thinking about the purpose of these tests

[b264]

:-D

[b264]

:shipit:

[Maroo-b]

+1