Skip token count request for DeepSeek Flash #6597

Job	Run time
build-and-check	3m 12s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 36s
test-integration-cli	49s
test-integration-web	45s
test-integration-packages/agent-runtime	46s
test-integration-common	46s
test-packages/billing	52s
test-integration-sdk	1m 13s
test-cli	57s
test-.agents	46s
test-packages/internal	46s
test-common	47s
test-sdk	57s
test-web	53s
test-packages/agent-runtime	45s
	16m 56s

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