test/system: Simplify capturing standard error from command substitution#1821

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debarshiray:wip/rishi/test-system-libs-drop-double-subshell-for-command-substitution-stderrdebarshiray/toolbox:wip/rishi/test-system-libs-drop-double-subshell-for-command-substitution-stderrCopy head branch name to clipboard