Delay loading of countries until hand raise lead modal opens

What does this MR do and why?

Delay loading of countries until hand raise lead modal opens

• so that we don't prematurely request countries on every single page load in projects and groups.
• see #577522 (closed)

Changelog: fixed EE: true

Screenshots or screen recordings

Before	After
Screen_Recording_2025-10-16_at_2.32.53_PM	Screen_Recording_2025-10-16_at_2.34.07_PM

How to set up and validate locally

1. follow these steps
2. observe the network tab on master vs this branch and how countries is only loaded on this branch when the modal is opened and no longer on every groups or projects page.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #577522 (closed)