Add CI jobs for each X86 instruction set architecture

[fiigii]

We have exposed all the X86 ISA knobs (like COMPlus_EnableFMA) in release build, but CI just has a subset.
https://github.com/dotnet/coreclr/blob/a089f64a7ad55a8ce0b3203b1bf87040775dff01/netci.groovy#L98-L104

We should add CI jobs for each X86 ISA knobs for testing target-specific code like dotnet/coreclr#21073

[fiigii]

cc @CarolEidt @tannergooding @BruceForstall

[tannergooding]

We can also simplify a couple of the checks (such as jitnox86hwintrinsic) now that we have them strictly hierarchical from base up

[fiigii]

Yes, we can use the new knob EnableHWIntrinsic that you added recently.

[BruceForstall]

This might be work that should wait for the conversion to Arcade / Azure DevOps.

@RussKeldorph

[fiigii]

Good to know, thanks.

[tannergooding]

@BruceForstall, do we have an ETA on the conversion?

It would be nice to have this additional validation enabled sufficiently before the feature ships to help validate correctness.

[BruceForstall]

Maybe @echesakovMSFT @RussKeldorph can share a timeline (I don't know the ETA).

[echesakov]

@tannergooding I am planning to merge in dotnet/coreclr#21966 later today or tomorrow, so this should unblock you from defining new test scenarios for Azure DevOps.

Just add the corresponding TestEnvironment items to testenvironment.proj file.