fix(Designer): Keyboard focus move outside of 'Insert dynamic content' dialog

[Elaina-Lee]

Requirement Checklist

• The commit message follows our guidelines

Type of Change

• Bug fix
• Feature
• Other

Current Behavior

Keyboard focus move outside of the 'Insert dynamic content' dialog when navigating using keyboard

New Behavior

Keyboard stays within the dialog unless 'esc' key is pressed. When using mouse to navigate, it can still exit the focus when clicked outside of dialog.

Impact of Change

• This is a breaking change.

Screenshots or Videos (if applicable)

Recording.2024-12-23.002608.mp4

[Eric-B-Wu]

I think we can look to trap focus in the tokenpicker, but it should be done in another way. With FocusTrapCallout, when users blur the tokenpicker, the focus always goes back to the editor which opened that tokenpicker. For example, if the user clicks another editor with the tokenpicker open, the focus isn't on the new editor, but rather the original editor that opened the tokenpicker