Hide copy button when user message has no text content [codecane] #5577

Job	Run time
build-and-check	2m 37s
test-integration-packages/internal	1m 9s
test-integration-packages/billing	1m 7s
test-integration-common	42s
test-integration-cli	39s
test-integration-packages/agent-runtime	47s
test-integration-sdk	42s
test-web	45s
test-packages/agent-runtime	55s
test-cli	1m 13s
test-common	44s
test-packages/internal	48s
test-packages/billing	44s
test-sdk	44s
test-integration-web	48s
test-.agents	42s
	15m 6s

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