backend-tests/infra: cli helpers for db migrations
backend-tests/infra: cli helpers for db migrations

individual tests will want clean and migrated DBs (indexes!), so
provide helpers which will be called by fixtures.

changelog: none

Signed-off-by: mchalczynski <3a897b56ed6fc284ae11e3e7ec3ea48d098a7178@rndity.com>

pasinskim/integration,pasinskim/integration,pasinskim/integration