Skip token count request for DeepSeek Flash (#659) #6598

Job	Run time
build-and-check	3m 11s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 3s
test-integration-web	45s
test-integration-sdk	1m 12s
test-integration-common	58s
test-sdk	41s
test-packages/internal	49s
test-cli	1m 9s
test-integration-cli	39s
test-common	48s
test-integration-packages/agent-runtime	47s
test-packages/agent-runtime	53s
test-packages/billing	39s
test-web	55s
test-.agents	46s
	16m 21s

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