[test][docker_execution] Redo database root_folder setup after prefix cleanup

The prefix is resynced after the CXX tests, therefore
ensure that the original root_folder setup is applied
again.

This avoids breaking tests when CXX tests run before
the raw access tests.
4 jobs for 105_refactor_database_sharing in 17 minutes and 42 seconds (queued for 1 second)