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8d25a4d678
Migrate view_builder to v2, to store the view build status of all nodes in the group0 based table view_build_status_v2. Introduce a feature view_build_status_on_group0 so we know when all nodes are ready to migrate and use the new table. A new cluster is initialized to use v2. Otherwise, The topology coordinator initiates the migration when the feature is enabled, if it was not done already. The migration reads all the rows in the v1 table and writes it via group0 to the v2 table, together with a mutation that updates the view_builder parameter in scylla_local to v2. When this mutation is applied, it updates the view_builder service to start using the v2 table.