sql: Add telemetry for zone config override on multi-region tables

[ajstorm]

Currently we require that the customer explicitly overrides the block to update zone configurations on multi-region tables. Unfortunately however, we have no way to track how often customers are overriding. We should add telemetry for cases where the overrride cluster variable is set and a zone configuration is updated. Additionally, we should be tracking how many times a user-modified zone configuration is overwritten by the system through the use of the multi-region abstractions.