fixed googleapis issue

[bkendall]

Description

Replaces usage of googleapis with a custom API handler. We try not to include googleapis because it's such a large package.

Fixes #9443

[gemini-code-assist]

Summary of Changes

Hello @bkendall, 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 aims to optimize the application by removing the dependency on the large googleapis package. It achieves this by implementing a custom, lightweight API handler specifically for the Cloud Testing API, thereby reducing the overall bundle size and resolving an issue where googleapis was unavailable in certain server environments. This change improves efficiency and maintainability by providing a more tailored API interaction.

Highlights

• googleapis Replacement: The googleapis library has been replaced with a custom API handler for the Cloud Testing API to reduce package size and resolve server issues where the full library might not be available.
• New API Module: A new module, src/gcp/apptesting.ts, was introduced to encapsulate a custom API client and the testEnvironmentCatalog function specifically for the Cloud Testing API.
• API Origin Definition: A new cloudTestingOrigin function was added in src/api.ts to define the base URL for the Cloud Testing API, allowing for environment overrides.
• Tool Update: The check_status tool in src/mcp/tools/apptesting/tests.ts was updated to utilize the new custom testEnvironmentCatalog function and now explicitly declares requiresAuth and requiresProject in its metadata.

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[gemini-code-assist]

Code Review

This pull request successfully replaces the googleapis dependency with a custom API handler for fetching the app testing environment catalog, which is a great move to reduce the overall package size. The implementation is solid, but I have a couple of suggestions to enhance type safety and add robustness to the new logic.

[gemini-code-assist]

Passing an empty string for projectId when it's missing could lead to a cryptic backend error. Since this tool now explicitly requires a project, it's safer to fail fast with a clear error message if projectId is not available. Please add a check to ensure projectId is present before making the API call.

    if (getAvailableDevices) {
      if (!projectId) {
        throw new FirebaseError("Project ID is required to get available devices but is missing.");
      }
      devices = await testEnvironmentCatalog(projectId, "ANDROID");
    }

[gemini-code-assist]

Using unknown for TestEnvironmentCatalog and the function's return type reduces type safety and makes the response harder to work with for consumers of this function. It would be beneficial to define a proper type for the TestEnvironmentCatalog based on the expected API response structure. Even a partial type definition with a TODO to fill it out later would be an improvement over unknown.

Suggested change

	type TestEnvironmentCatalog = unknown;
	/**
	* Gets the catalog of supported test environments.
	*/
	export async function testEnvironmentCatalog(
	projectId: string,
	environmentType: EnvironmentType,
	): Promise<unknown> {
	interface TestEnvironmentCatalog {
	// TODO: Define the properties of the test environment catalog based on the API response.
	}
	/**
	* Gets the catalog of supported test environments.
	*/
	export async function testEnvironmentCatalog(
	projectId: string,
	environmentType: EnvironmentType,
	): Promise<TestEnvironmentCatalog> {