refactor: rename configs to defaults, remove swarm

[nxsaken]

Description

Rename the configs directory to defaults since that's what it really is (default docker compose configs, default executor.wasm, default genesis.json, etc.)

Linked issue

Closes #4293, #4320

Benefits

Conveys the purpose of the directory better.

Checklist

• I've read CONTRIBUTING.md
• I've used the standard signed-off commit format (or will squash just before merging)
• All applicable CI checks pass (or I promised to make them pass later)
• (optional) I've written unit tests for the code changes
• I replied to all comments after code review, marking all implemented changes with thumbs up

[mversic]

This was renamed for the 5th time already. We have to agree on this for once