Trigger focus trap

[fcastill]

Description

This PR implements a "focus trap" in the confirmation modals of the trigger configuration so they're navigatable using keyboard.

Motivation and Context

Make it easier to navigate the app with keyboard.

How has this been tested?

Manually

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build/CI related changes
• [ ] Documentation related changes
• [ ] Other... Please describe:

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.