Fix -- Remove sort of feature keys from preprocessed metadata FeatureSpecDict

[mkolodner-sc]

Scope of work done

• Removes the sorted calls operating on the feature and label keys, which was causing training failures with the FeatureEmbeddingLayer
• Add test to ensure that the proto feature keys and the feature keys from the pb wrapper are the same in value and order.

Where is the documentation for this feature?: N/A

Did you add automated tests or write a test plan?

Updated Changelog.md? NO

Ready for code review?: NO

[kmontemayor2-sc]

Thanks Matt, excellent digging :)

[svij-sc]

Some of these keys that are sorted don't have only one access pattern.
Thus, i'd imagine if they are sorted in one place but not in other places it can easily cause issues.