Add user journey test to mark build as active

[peytondmurray]

Fixes #671.

Description

This PR adds a user journey test which checks that an admin can activate an old build for a given environment.

This pull request:

• Adds a user journey test
• Adds a new test environment needed for the test: simple_environment2.yaml

Pull request checklist

• [x] Did you test this change locally?
• [x] Did you update the documentation (if required)?
• [x] Did you add/update relevant tests for this change (if required)?

How to test

Run the conda-store server:

docker compose up

Then run the test:

cd conda-store-server
pytest tests/user_journeys/test_user_journeys.py::test_admin_set_active_build

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