[WPB-9551] Clean up phone data

[mdimjasevic]

This removes all the phone-related data from the Brig database.

Tracked by https://wearezeta.atlassian.net/browse/WPB-9551.

Checklist

• [ ] Factor out DataMigration modules into a library. Brig and Galley have identical <Brig/Galley>.DataMigration implementations. Pull that out into a new library and reuse it in the services.
• [ ] Add a new entry in an appropriate subdirectory of changelog.d
• [ ] Read and follow the PR guidelines

[battermann]

closed in favor of https://github.com/wireapp/wire-server/pull/4124