Deploying framework-dependent .NET apps will fail if service doesn't have right version

[timheuer]

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When publishing to app service or functions, a user may be using an framework-dependent deployment option (FDD) (the default). Upon publishing (especially with newer versions, go-live RCs, etc.) there is a possibility that the resulting service doesn't have FDD support yet. While self-contained deployment (SCD) is an option it isn't the default in our flows.

Publishing from the extension should do a pre-check with all known information to see if the resulting deployment will succeed in a runtime start (sans user-delivered errors).