Refresh testing guide (#10588)
Refresh testing guide (#10588)

Update the available testing targets and their support

* Provide a table of targets with unit --> e2e complexity
* Re-order compiler tests and runtime tests
google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,google/iree,google/iree,google/iree