Prepare for container reuse

[Barsonax]

• Generate the same sequence of database name per run for the same set of migrations. This allows test to reuse state from a previous run speeding them up and prevents many databases being created when reusing containers.
• Clean database before the test instead of after, this will allow dev's to inspect the database state after a test was run.

Container reuse is not enabled by default though as its still experimental and during my own testing I noticed its not always stable. When starting multiple runs at the same time multiple containers are created after which testcontainers will keep crashing.