Add CI workflow to test user installation/deployment (E2E testing)

[jemissik]

Current tests all use the developer installation of boa, so it's easy to have user install instructions that are out-of-date and might not work properly. It would be good to add a "deployment test" that would follow the installation instructions for general users (not developers) and make sure the environment installs properly and the basic test run works.

Ideally this will be written in a way where the install steps won't need to be in multiple places, maybe like having one shell script with the user install steps, which then can be run by the tests or included in the docs pages.

[madeline-scyphers]

I think maybe we can just add a pytest run to our conda feedstock that will ensure our tests run on conda before a new conda release with the exact conda release. Think that is fine?