[24.0] Use config_section to distinguish between galaxy and ts or other apps

[jdavcs]

Fix for #18205

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[natefoo]

shed@eddie:/srv/toolshed/test/jdavcs-240_ts_db_script$ ./.venv/bin/python3 ./scripts/toolshed_db.py -c /srv/toolshed/test/config/tool_shed.yml dbversion
INFO:alembic.runtime.migration:Context impl PostgresqlImpl.
INFO:alembic.runtime.migration:Will assume transactional DDL.
969bbf7bcc29 (head)

Thanks @jdavcs !