fix(query-builder): Ensure that search bar only has a single tab stop

[malwilley]

Pressing tab from the element before the search bar should focus the last input inside the search bar. While focus is within the search bar, tabbing or shift tabbing should exit the search bar, not focus any of the other focusable elements within it.

• Adds tabIndex="-1" to all the focusable elements
• Ensures that the selectionManager focus state gets updated correctly when arrowing around the search bar. This ensures that when the search bar receives focus again, the correct element is focused.
• Adds an onFocus handler to the top level grid element that will set the focus to the last element if the user hasn't interacted with the search bar yet.

[codecov]

Bundle Report

Changes will increase total bundle size by 7.74kB ⬆️

Bundle name	Size	Change
app-webpack-bundle-array-push	26.79MB	7.74kB ⬆️