[FDC] Ask for region if app description is given

[fredzqm]

1. Ask for region if app description is given. Missed this in the past, we create "unlinked" services in us-central1 before.
2. Changed default region to be us-east4 in template as well.

No change log because this is a minor bug fix. Hard to externalize

[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 enhances the Data Connect initialization flow by ensuring that users are prompted to specify a GCP region when providing an application description, addressing a previous oversight that led to services being created in a fixed default region. Additionally, it standardizes the default region to us-east4 across the relevant configuration and prompting mechanisms, improving consistency and user experience.

Highlights

• Region Prompting Logic: The system now explicitly prompts the user to select a GCP region during Data Connect initialization if an application description is provided, preventing the creation of "unlinked" services in a default region without user input.
• Default Region Update: The default GCP region used for Data Connect services has been updated from us-central1 to us-east4 in both the initialization process and templates.

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[gemini-code-assist]

Code Review

This pull request addresses an issue where the CLI would not prompt for a region when generating a Data Connect service with Gemini on a Spark plan, causing it to default to an incorrect region. The changes correctly add this prompt. Additionally, the default region is updated to us-east4 and some code is refactored for better reusability. The changes look good, but I've identified one potential robustness issue where the CLI could crash if no locations are found for a project. My suggestion addresses this.