Implement common backend operator-level tests

[GregoryComer]

🚀 The feature, motivation and pitch

As described in #11140.

Alternatives

No response

Additional context

No response

RFC (Optional)

No response

[cbilgin]

• XNNP tests created and issues submitted

• CoreML tests created and issues submitted

• Vulkan and QNN next and ETA is 2 weeks.

[GregoryComer]

• Working through issues on QNN integration. Should be finished by EOW.

• Vulkan wired up, working through test data and writing up bugs. Initially not too many failures.

[GregoryComer]

Main stack is merged: #12847. Closing.