Fix some Cosmos discriminator issues #17876
Merged
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Description
Don't add discriminators for embedded entities
Allow to update entities without discriminators
Don't try to add the default discriminator if a conflicting property already exists
Fixes #17764
Fixes #17302
Fixes #17814
Customer impact
Several basic scenarios involving discriminators will be unblocked now.
Regression
N/A, 3.0 will be the first RTM release for the Cosmos provider
Risk
Low