R1:6417e950f622

Don't reclaim resources that have a destroyed lease less than 3 minutes old

Summary:
Ref T13676. The 3-minute grace period when a resource can not be reclaimed after its leases are released currently doesn't work reliably because the Resource object usually isn't actually updated when a lease is released.

Add an additional check for recently-destroyed leases, and extend the grace period if we find any.

Test Plan:
- See T13676. Ran reproduction sequence there, observed immediate resource reclamation.