R1:4dd32dca3e8f

When a Drydock Blueprint promises us a resource but can't deliver, continue believing in it

Summary:
Ref T13073. When a Blueprint says it will be able to allocate a resource but then throws an exception while attempting that allocation, we currently fail the lease permanently.

This is excessively harsh. This blueprint may have the best of intentions and have encountered a legitimately unforseeable failure (like a `vm.new` call to build a VM failed) and be able to succeed in the future.

Even if this…