Updated 2.0 Gemini models to use fullCapabilities

[devcrocod]

Motivation and Context

2.0-flash and 2.0-flash-lite support structured output

Breaking Changes

None

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Type of the changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tests improvement
• Refactoring

Checklist

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

[Copilot]

Pull request overview

This PR adds structured output support to Gemini 2.0 Flash and Flash-Lite models by updating their capability definitions from a manual combination to using fullCapabilities.

• Replaced standardCapabilities + toolCapabilities + multimodalCapabilities with fullCapabilities for both models
• This change adds structuredOutputCapabilities (JSON Basic and Standard schema support) to these models
• The update aligns these 2.0 models with the 2.5 models which already use fullCapabilities

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