Fix CI test-cli exit code 123 by replacing xargs with direct bun test #5594

Job	Run time
build-and-check	2m 42s
test-integration-cli	43s
test-integration-common	44s
test-integration-sdk	47s
test-integration-packages/agent-runtime	41s
test-integration-packages/internal	1m 1s
test-integration-packages/billing	1m 2s
test-integration-web	45s
test-cli	1m 29s
test-packages/billing	41s
test-sdk	44s
test-web	47s
test-packages/internal	56s
test-packages/agent-runtime	45s
test-common	41s
test-.agents	36s
	15m 4s

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