MySQL Router How-to - Major rollback

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Major Rollback

:information_source: Example: MySQL Router 9.0 -> MySQL Router 8.0

Currently, the charm supports MySQL Router 8.0 only; therefore, minor rollbacks are only possible. Canonical is NOT planning to support in-place rollbacks for the major MySQL Router version change as the old MySQL cluster installation with old MySQL Router will stay nearby and can be reused for the rollback.