[Firebase AI] Return default proto values with $outputDefaults

[andrewheard]

Updated requests in Firebase AI to set the $outputDefaults system parameter to true. This prevents the backend from omitting default values when serializing JSON and fixes a decoding issue in the GenerateContentIntegrationTests.generateImage test.

#no-changelog

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[paulb777]

Will this increase cost?

[andrewheard]

Only in terms of bandwidth since the JSON payload will be larger in cases where defaults were previously omitted.

Note: Google AI actually behaves this way by default (default values have always been included in the JSON). Vertex AI always omits them unless this option is specified.

This has also caused some confusion in the past since, for example, blocked: false was omitted in Vertex since false is the default. Other cases tend to revolve around 0 getting omitted for numeric fields.