tests: change all CLI test runners to use the new `--test-instance` argument scheme#17949

dpgeorge wants to merge 4 commits intomicropython:mastermicropython/micropython:masterfrom

dpgeorge:tests-convert-all-to-use-test-instance-argdpgeorge/micropython:tests-convert-all-to-use-test-instance-argCopy head branch name to clipboard