Igor Motov 93beea1f67 Snapshot/Restore: Move in-progress snapshot and restore information from custom metadata to custom cluster state part
Information about in-progress snapshot and restore processes is not really metadata and should be represented as a part of the cluster state similar to discovery nodes, routing table, and cluster blocks. Since in-progress snapshot and restore information is no longer part of metadata, this refactoring also enables us to handle cluster blocks in more consistent manner and allow creation of snapshots of a read-only cluster.

Closes #8102
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