Fix hostfxr_get_available_sdks_result_fn array size type.

[tmds]

This changes the array size type to 'int' so it matches the 'int32_t' native type.

This was typed as an enum.
The enum type is accepted by CoreCLR.
Mono throws a MarshalDirectiveException because it requires the array size to be an integral type.

Fixes dotnet/runtime#119991.

@rainersigwald ptal

cc @jkotas @medhatiwari @giritrivedi

[Copilot]

Pull Request Overview

Fixes a marshaling compatibility issue between CoreCLR and Mono by changing the array size parameter type from an enum to int in the hostfxr_get_available_sdks_result_fn delegate. This change ensures Mono can properly marshal the unmanaged function pointer, as Mono requires array size parameters to be integral types while CoreCLR accepts enum types.

• Changes array size parameter type from hostfxr_resolve_sdk2_result_key_t enum to int
• Maintains compatibility with the native int32_t type
• Resolves MarshalDirectiveException thrown by Mono runtime

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