Fix banned user test to match new suspension message #6150

Job	Run time
build-and-check	2m 43s
test-integration-packages/billing	1m 12s
test-integration-packages/internal	1m 4s
test-integration-packages/agent-runtime	48s
test-integration-sdk	1m 14s
test-integration-cli	44s
test-common	47s
test-integration-common	50s
test-integration-web	51s
test-cli	54s
test-.agents	51s
test-packages/internal	52s
test-packages/billing	42s
test-packages/agent-runtime	48s
test-sdk	52s
test-web	1m 2s
	16m 14s

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