Add GitLab Default Information Modal

Description

When users select the GitLab Default option in Model Selection, a pop-up modal should appear with information regarding the behaviour of the selection. Before persisting the update, a confirmation is required that the user understands the consequences of their selection.

Modal design

Screenshot_2025-07-16_at_3.55.26_pm

Edited by 🤖 GitLab Bot 🤖