[Improvement] MySQL ClusterVersion mismatch should be detected and reconciled automatically

[im0x0ing]

Problem
When upgrading to KubeBlocks 0.9, the ClusterVersion of existing MySQL Cluster and InstanceSet resources does not match the expected version in KB 0.9.

Current Workaround
A migration script is executed manually during the upgrade to update the MySQL Cluster's ClusterVersion to the KB 0.9 compatible version.

Expected Behavior
The code should detect when the ClusterVersion of MySQL Cluster/InstanceSet does not match the target version, and automatically update it to the correct version.