[test] Update for remote-run-ing tests on a different macOS #18966
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Most of this is just "remember to specify the inputs and outputs on the command line, so remote-run can see them". A bit is "prefix environment variables with '%env-'". And the last few are "yeah, this was never going to work in a remote environment".
In the few cases where I couldn't think of anything reasonable, I just marked the test as "UNSUPPORTED: remote_run", a new "feature".