[expo-constants] use Updates.manifest if it exists and is non-empty #10668
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Why
One step in resolving #7721 . Longer term solution is to move away from depending on Constants.manifest in other libraries where possible. This PR will not solve the issue in all cases -- notably, for bare apps without expo-updates, and for bare apps with expo-updates running an embedded update for which no manifest exists -- but it will at least increase the number of cases where Constants.manifest is defined.
How
If expo-updates is installed and Updates.manifest exists and is nonempty, override the exported manifest object with the one from expo-updates.
Test Plan
Added jest tests to cover all cases I could think of, all tests pass.