Add QEMU detection check

[am11]

https://github.com/dotnet/runtime/pull/104094/files#r1657541084

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[jkotas]

@tomeksowi @yurai007 Does this detect the QEMU RISCV environment that you are using to run tests?

[am11]

GC scenario test failure seems to be #63774, unrelated to changes.

[yurai007]

@tomeksowi @yurai007 Does this detect the QEMU RISCV environment that you are using to run tests?

@jkotas: let me check this, I will share results soon.

[jkotas]

Given that this is not a reliable method to detect QEMU, I do not think that it is a good fit for minipal and production code.

[am11]

@jkotas did you try it?

[jkotas]

@jkotas did you try it?

I did not. I can believe what @yurai007 says.

I do not particularly like that the change has 3 different ways to guess whether the process is running under QEMU. It suggests that it is not reliable. I wish there was one proper way to detect QEMU that is documented on https://qemu.org/.