[Designer][Accessibility] Set FieldPicker initial focus to first item #5678
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Related Issue
Fixes ADO 30910259
Description
FieldPicker sets its focus on a container view, which isn't useful for keyboard users. PR changes it to set focus on root tree item instead.
Sample Card
N/A
How Verified
Local build:
![30910259](https://user-images.githubusercontent.com/4442788/115060005-51963600-9eb5-11eb-9a39-dba93dcbaa24.gif)
Microsoft Reviewers: Open in CodeFlow