fix: add back devcontainer db and redis services

[patheard]

Summary

Add the db and redis services back to the devcontainer's docker-compose file to support localhost environments without a LocalStack license.

Test instructions | Instructions pour tester la modification

1. Remove all running docker containers.
2. Build the devcontainer.
3. Setup your local .env to connect to the db and redis services.

   DATABASE_URL=postgres://postgres:chummy@db:5432/forms
   REDIS_URL=redis

4. Run yarn dev and expect the app to load at http://localhost:3000.

Unresolved questions / Out of scope | Questions non résolues ou hors sujet

None.

Pull Request Checklist

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• [x] Have you completely tested the functionality of change introduced in this PR? Is the PR solving the problem it's meant to solve within the scope of the related issue?
• [x] The PR does not introduce any new issues such as failed tests, console warnings or new bugs.
• [ ] If this PR adds a package have you ensured its licensed correctly and does not add additional security issues?
• [x] Is the code clean, readable and maintainable? Is it easy to understand and comprehend.
• [x] Does your code have adequate comprehensible comments? Do new functions have docstrings?
• [x] Have you modified the change log and updated any relevant documentation?
• [x] Is there adequate test coverage? Both unit tests and end-to-end tests where applicable?
• [ ] If your PR is touching any UI is it accessible? Have you tested it with a screen reader? Have you tested it with automated testing tools such as axe?

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