Add product_init_mcp and fix param of product_init

[fredzqm]

In Google Analytics, products_initialized is always empty because the init() shifts it to an empty list in the end.

Want to figure out how many time init dataconnect was called.

[gemini-code-assist]

Summary of Changes

Hello @fredzqm, 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 addresses a bug where the products_initialized parameter in Google Analytics events was consistently empty. It resolves this by ensuring that the list of initialized products is captured at the appropriate time, before subsequent operations might clear or modify this data, thereby providing accurate analytics data for product initialization.

Highlights

• Data Capture Correction: The productsInitialized string, representing the list of features, is now captured before the init function is executed. This ensures that the correct and complete list of products is recorded for analytics.
• Analytics Parameter Fix: The products_initialized parameter sent to the trackGA4 function now correctly uses the pre-captured productsInitialized value, resolving an issue where this parameter was previously empty.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a bug where the products_initialized analytics parameter was always being sent as an empty string. The issue was that the list of features was being read after the init function had already processed and cleared it. By capturing the feature list in a variable before calling init, the fix ensures the correct data is sent for analytics. The change is well-targeted and effective. I have one minor suggestion to improve code clarity.

[gemini-code-assist]

While this is correct, the optional chaining (?.) and the fallback to an empty string (|| "") are redundant here.

Based on the control flow in this function:

• setup.features is assigned a value at either line 209 or 211.
• The check at line 229 ensures that setup.features is a non-empty array, otherwise an error is thrown.

Therefore, setup.features is guaranteed to be a string[] with at least one element at this point, so you can safely call .join(',') directly. This makes the code slightly cleaner.

Suggested change

	const productsInitialized = setup.features?.join(",") || "";
	const productsInitialized = setup.features.join(",");

[fredzqm]

@joehan Please take a look~ Simple PR to fix init's GA metrics.

I was trying to figure out how many people ran firebase init dataconnect