fix(ember): Fix runtime config options not being merged #3791
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Summary
Runtime options can be ignored in production mode because of embroider macros differences between dev and production. Instead of relying on the config object reference being provided, we'll use a global instead to hold on to the merged config between the init call and the performance initializer code.
Aside: The code to pull the global is intentionally not DRY'd as to not export the function, which should be internal use only as it's an implementation detail.
Refs #3785 (thanks @kiwi-josh for letting us know)