Workaround helm hooks not streaming logs

What does this MR do?

We use Helm hooks to run DB migration and initialization but because there is no feature to stream hook logs, we use a function to show logs from the helm upgrade... command.

$CI_ENVIRONMENT_SLUG-db-initialize and $CI_ENVIRONMENT_SLUG-db-migrate pod selectors come from the auto-deploy-app chart.

What are the relevant issue numbers?

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/52197

Testing

See log output from https://gitlab.com/DylanGriffith/rails-auto-devops-migration-test/-/jobs/104026162

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #52197 (moved)