Create database migration tests

[danthe1st]

Create a test that does the following:

• Load the initial database schema into an in-memory h2 database
• Get a list of all database migration scripts using the same logic that is also used for autocomplete in /db-admin migrate. This should be successful (it might require updating the command)
• Run all database migration scripts with the in-memory database using the same logic that is also used by /db-admin migrate. There shouldn't be any errors.

This test should work in both JVM and native-image mode.