[feature] scripts for running schema migrations should run ALL migrations available

[masukomi]

currently the scripts/bash_helpers/migrations.sh bash helper script can find and run the next schema migration, but won't run all of the pending ones if the user is upgrading across multiple versions.

for example:

If you're on schema version 1 and there are migrations for version 2 & 3 it will only run the one for version 2

Desired behavior

If you're on schema version 1 and there are migrations for version 2 & 3 it will run the migration for 2 & then the migration for 3

Implementation thoughts

I'm imagining something like a run_migrations function with a while loop in it that keeps calling run_next_migration_file_if_present and incrementing a number until there's no more migrations to run. That's not quite how it'll work, but something along those lines.