As discussed in #35568 (review), we need to construct a multi job helix project that calls into sendtohelix.proj with different variables and in parallel.

A good example for this approach would be the mono interpreter. Since it is built within every mono runtime, it can be enabled with the --interpreter parameter. It would be wasteful of CI resources to do this independently of a regular mono test run, so shuffling different parameters into sendtohelix.proj would do the trick.

On the yml side, we would need to trigger the multi job helix project:

And then within the multi job helix project, we would shuffle different parameters to sendtohelix.proj as it exists today.