Platform, Backend Probe and Backend Capability APIs not unified between the in proc SDKs

[bbonaby]

Relevant area(s)

Linux, Windows, macOS

Brief description of your issue

Both Node and dot net in SDKs should use the mxc ffi layer to probe backend capability and availability.

Also: The node sdk currently uses the executables like wxc-exec to query for platform support> I noticed in here: https://github.com/microsoft/mxc/blob/main/sdk/node/src/platform.ts that there are probes for seatbelt, and bubble wrap. These probes go through their executables.

We should make sure these probes go through the mxc_ffi layer for both node and dotnet. The Rust SDK should also have these

Steps to reproduce

Attempt to use node sdk and see that you any probe support uses the executables

Expected behavior

probe support for all non rust sdks use mxc_ffi layer. This includes dotnet as well. For rust SDK this support should already be there.

Actual behavior

existing probe support uses executables for node.