fix(go/plugins/googlegenai): add support to IncludeServerSideToolInvocations

[Gerifield]

ISSUE: #4970

CHANGELOG:

• Update genai toGeminiToolChoice function to not overwrite the tool config if it exists

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the googlegenai plugin by updating its core dependency and refining the logic for handling tool configurations. The primary goal is to ensure that existing tool configurations, particularly those related to server-side tool invocations, are preserved when applying new function calling settings, thereby preventing data loss and improving the robustness of tool integration.

Highlights

• Dependency Update: The google.golang.org/genai dependency has been updated from v1.41.0 to v1.51.0.
• Tool Configuration Logic Refinement: The toGeminiToolChoice function now accepts an existing ToolConfig and updates its FunctionCallingConfig if present, preventing unintended overwrites of other tool configuration settings like IncludeServerSideToolInvocations.
• Function Signature Change: The toGeminiToolChoice function signature in go/plugins/googlegenai/tools.go was modified to include an initial toolConfig parameter.

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[gemini-code-assist]

Code Review

This pull request updates the google.golang.org/genai dependency from v1.41.0 to v1.51.0. Correspondingly, the toGeminiToolChoice function in the googlegenai plugin has been refactored to accept an existing genai.ToolConfig as an argument. If an existing configuration is provided, the function now updates its FunctionCallingConfig with the specified mode and allowed function names, rather than always creating a new genai.ToolConfig.

[Gerifield]

Here is an example config how to test/trigger it:

ist := true
geminiSpecConfig := &genai.GenerateContentConfig{
		ToolConfig: &genai.ToolConfig{
			IncludeServerSideToolInvocations: &ist,
		},
		Tools: []*genai.Tool{
			{GoogleSearch: &genai.GoogleSearch{}},
		}
	}

Then it can be added to the Generate option via: ai.WithConfig(geminiSpecConfig)
If there are tools added with the ai.WithTools command, it should still work and do it's job.