[Firebase AI] Deprecate CountTokensResponse.totalBillableCharacters
#14998
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Deprecated the
totalBillableCharacters
property onCountTokensResponse
the concept of billable characters does not apply to Gemini 2.0 series models and newer. Billing is based on the token count returned intotalTokens
. This property will always benil
for the Gemini Developer API backend. While it may be present for the Vertex AI backend, it should not be used for billing calculations. Resolves #14934.