Respect `MinQueryIndex` in `QueryOptions` on getting state snapshot

[hntrmrrs]

In an effort to fix the problems leading to https://github.com/hashicorp/nomad/issues/12261#issuecomment-1235367464 this uses SnapshotMinIndex instead of Snapshot with a minimum index from the QueryOptions provided. Is this approach reasonable, or is my understanding of the state snapshotting way off base?

I have had trouble reliably reproducing the behaviour described in #12261 in a test environment.