[ENG-6346] Update logic to set initial folder id in file manager

[futa-ikeda]

• Ticket: ENG-6346
• Feature flag: n/a

Purpose

• Address a bug where the root folder picker doesn't show the correct folder content when widget loads (shows root folder's parent, not root folder's contents). See video in ticket for better description

Summary of Changes

• Update types
• Set currentFolder to be the explicit Id of the starting folder
• Always show Home option in breadcrumbs

Screenshot(s)

• Prevents this bug where "All Files" is apparently the current folder content that you are viewing, and while also only showing the "All Files item"
  
• Should look like this if "All Files" is the selected root folder upon loading this page:
  
• Should look like this if no root folder is selected
  

Side Effects

QA Notes

[brianjgeiger]

One small thing

[brianjgeiger]

Should this be 'Go to home' or 'Go to home folder' to match up the aria label with the UI?