sdk run_terminal_command: Also truncate stderr #3910

Job	Run time
build-and-check	2m 34s
test-integration-backend	36s
test-integration-cli	30s
test-integration-.agents	30s
test-integration-npm-app	32s
test-integration-common	33s
test-integration-web	33s
test-integration-packages/agent-runtime	31s
test-.agents	31s
test-backend	44s
test-cli	29s
test-web	37s
test-common	31s
test-npm-app	38s
test-packages/agent-runtime	30s
	10m 19s

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