The VersionContext type has an isInitialized() method to detect if an operation has an Operation FCV or not.
This is bound to cause confusion specially when we allow an Operation FCV to be the uninitialized FCV.

Rename it to a more descriptive name, e.g. hasOperationFCV().

A closely related quirk is that for the kNoVersionContext and kVersionContextIgnored_UNSAFE singletons, isInitialized() returns true. We should likely revise them to be false instead.