[Tech] Simplify our E2E tests

[CommandMC]

Our E2E test configuration, while being very robust, was a bit overkill for what we're doing with it. Instead of running the tests in a Docker container to isolate them, we can simply set Heroic's configuration directory to a temporary one. In addition, the "packaged" and "dev" tests only differ slightly (one having Heroic's code in the build directory, while the other has it zipped up in a single file somewhere in dist), but this difference is not significant enough to warrant two separate test runs IMO

I hope that by making it easier to run these tests, we can start to use them properly in the future

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[arielj]

looks good to me