Update how apply positions are done

[BrendanChou]

Changelist

• Rename ApplyUpdatesToPositions() -> CalculateNewPositionSizes() to denote that no changes are happening, just the return value is used. This makes it less likely to be confused with functions that actually modify the structs like UpdatePerpetualPositions and UpdateAssetPositions
• Add a Validate() function to type.Update to check for duplicate updates. Not sure if this is needed in the long-run but make the code cleaner to check this "up front"

Test Plan

TODO

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