Add internal analyzer to avoid `init` in public APIs

[Youssef1313]

This feels like it needs to be somehow enforced, so it does not get reverted next time someone does big update to new features.

Originally posted by @nohwnd in #7241 (comment)

[Youssef1313]

Note: we have APIs with init in MTP, which we won't be able to change currently.

[nohwnd]

I meant just this api that breaks the c++/cli integration, not rejecting init usage entirely.

[Youssef1313]

It's still applicable elsewhere IMO. Adding it anywhere in MSTest public API will likely cause issues for C++/CLI.