db-postgres: payload migrate command should exit with non-zero exit code when the migration fails

[ikenox]

Currently when executing npm run payload migrate command and its migration fails partially, only an error log is generated and the process exits with exit code 0.
ref: https://github.com/payloadcms/payload/blob/e180131/packages/db-postgres/src/migrate.ts#L100-L103

So currently we don't have a way to programmatically know whether the migration process is success.
It would be useful if migration fails with a non-zero exit code, especially for CI workflow.