Integrate `migrate` rock

[mvlassis]

Context

Integrate the migrate rock to the corresponding charm.

What needs to get done

• Change the image used in the corresponding charm to new rock image from our team's registry

Definition of Done

The rock is integrated, and all the integration tests pass.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6512.

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[mvlassis]

We're closing this issue since we have run into constraints by using Pebble as a service manager. This makes it not possible to use Pebble without modifying the upstream files. See the comment I left on the tracker issue for more information.