Added user journey test to delete old environment

[peytondmurray]

Fixes #670.

Description

This PR creates a user journey test for checking that an admin can delete an environment.

Pull request checklist

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

How to test

Wait for CI to run, or start the conda-store server in a docker container and do pytest -m user_journey.

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[dcmcand]

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[peytondmurray]

Test issue is unrelated:

Checking /tmp/baipp/dist/conda_store_server-2024.3.1-py3-none-any.whl: ERROR    InvalidDistribution: Metadata is missing required fields: Name,        
         Version.                                                               
         Make sure the distribution includes the files where those fields are   
         specified, and is using a supported Metadata-Version: 1.0, 1.1, 1.2,   
         2.0, 2.1, 2.2.