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runner beyond bare metal: honour [target.<triple>].runner on hosted targets, typed launch failures, not-run reporting, [xlings] values per host (#544) #1246

Job	Run time
e2e 1/2 (linux x86_64, self-host)	1m 5s
e2e 2/2 (linux x86_64, self-host)	1m 5s
hermetic e2e (no host toolchain, container)	52s
bare-metal e2e (riscv64-none-elf, qemu)	52s
	3m 54s