Subset of tickets in #614 that deal with the "Modals" category of EUI, anything that falls on or under this URL: https://elastic.github.io/eui/#/guidelines/modals

• First modal example does not adequately focus the primary modal button First modal example does not adequately focus the primary modal button #700
• Dialogs Need to Signal Context Switch to Users Upon Opening Dialogs Need to Signal Context Switch to Users Upon Opening #712