Token count endpoint: handle non-anthropic models by using default mo… #5505

Job	Run time
build-and-check	2m 37s
test-integration-packages/billing	1m 7s
test-cli	1m 14s
test-common	40s
test-.agents	38s
test-packages/billing	40s
test-integration-sdk	42s
test-integration-packages/agent-runtime	42s
test-packages/agent-runtime	1m 0s
test-integration-common	46s
test-web	45s
test-packages/internal	53s
test-integration-packages/internal	45s
test-integration-cli	37s
test-sdk	50s
test-integration-web	49s
	14m 45s

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