The frontend `e2e_test` doesn't have a working build cache setup,
causing really slow builds = slow test jobs. These changes reduce total
test runtime from ~12 minutes to ~5 minutes.
### Changes 🏗️
- Inject build cache config into docker compose config; let `buildx
bake` use GHA cache directly
- Add `docker-ci-fix-compose-build-cache.py` script
- Optimize `backend/Dockerfile` + root `.dockerignore`
- Replace broken DIY pnpm store caching with `actions/setup-node`
built-in cache management
- Add caching for test seed data created in DB
### Checklist 📋
#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
- CI
Restructuring the Repo to make it clear the difference between classic autogpt and the autogpt platform:
* Move the "classic" projects `autogpt`, `forge`, `frontend`, and `benchmark` into a `classic` folder
* Also rename `autogpt` to `original_autogpt` for absolute clarity
* Rename `rnd/` to `autogpt_platform/`
* `rnd/autogpt_builder` -> `autogpt_platform/frontend`
* `rnd/autogpt_server` -> `autogpt_platform/backend`
* Adjust any paths accordingly
* initial cleanup of github workflows
* only run pr-label workflow on push to master
* move docker ci/release summaries to scripts
* add XS label for PR's under 2 lines
* draft test job for Docker CI
* fix & activate Docker CI test job
* add debug step to docker CI
* fix Docker CI test container env
* Docker CI build matrix
* fixup build summaries
* fix pipes in summary
* optimize Dockerfile for layer caching
* more markdown escaping
* add gha cache scopes
* add Docker CI cache clean workflow
