move test game config file, change GameAlphaStart.js config file loaded

#### What's this PR do?
We've moved the test game config into its own `test-competitive-stories.json` file, but we've left the original test config file within `competitive-stories.json.` Note the comment in `test/gameAlphaStart.js`--while it seems like we can require `competitive-stories.json` within the test game itself (and thus it seems like we can just change the config file required to run tests on that config), it's not simple. Future refactoring needed. 

#### How should this be manually tested?
running 'npm test' from the command line.