Use CorInfoCallConvExtension throughout runtime interop code #47251
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As preparation for implementing #46775, this PR changes the interop code in CoreCLR to use CorInfoCallConvExtension as the representation for calling conventions internally instead of CorPinvokeMap or CorUnmanagedCallingConvention.
This change enables us to only have to add support for propagating new calling conventions significantly more easily since we won't need to determine how to represent new calling conventions using the old enums.