Improve diagnostics when /bin/sh is unavailable#11847
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Some container images do not include /bin/sh (for example, scratch or distroless images).
In this case, InternalCommandPortListeningCheck fails with exit code 127, but the warning message does not clearly explain the reason.
This change adds a more specific warning message when /bin/sh is not available and includes the original error message to help users understand the problem more quickly.
Fixes #3317