[DEV-9989] update modals

[adamdoe]

DEV-9989

On maps, when the modal is too large the modal was cutoff by the overflow CSS property and then extended above the top fold of the screen. This keeps the modal in view and allows vertical scrolling.

Testing Steps

• Run yarn storybook
• Open (link)[http://localhost:6006/?path=/story/components-templates-map--map-modal]
• Verify the modal is centered on desktop viewports
• Verify the modal doesn't extend above the top of the screen on mobile viewports

Self Review

• I have added testing steps for reviewers
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing unit tests are passing

Screenshots (if applicable)

Additional Notes