ssh kitten: Fix -o RemoteCommand handling #12830

Job	Run time
Linux package	3m 44s
Linux (python=3.11 cc=gcc sanitize=1)	2m 59s
Linux (python=3.12 cc=clang sanitize=1)	2m 27s
Linux (python=3.10 cc=gcc sanitize=0)	1m 55s
macOS Brew	5m 54s
Test ./dev.sh and benchmark	1m 35s
Bundle test (ubuntu-latest)	1m 59s
Bundle test (macos-latest)	3m 28s
	24m 1s

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