* feat: auto-provision volumes on all machines for global services
* fix: schedule global service volumes only on machines that need them
* fix: use union of eligible machines for volumes shared by global services
* test: restore global with missing volume fails test
* refactor: simplify volume scheduler by removing redundant check
Move isVolumeSharedBetweenGlobalAndReplicated check earlier to fail
fast, then use isVolumeForGlobalService instead of the now-redundant
isVolumeOnlyForGlobalServices function.
