QA and test new reporting feature

[Donnype]

Also see #3729. We should keep track of the final cleanups and TODOs here.

TODO

• QA onboarding flow
• Fix the unit and integration tests (@Donnype)

QA

• Onboarding skippen
  • Show empty helper text on history page and scheduled page (no empty tables)
  • Query Concatenated Report with 0 OOIs
  • Query Aggregate Report with 0 OOIs
• Onboarding
• Report with OOI selection
  • Single Report
  • Concatenated Report
  • Aggregate Report
  • Multi Report
• Report query
  • Single Report
  • Concatenated Report
  • Aggregate Report
  • Multi Report
• Bulk actions
  • Rename
  • Rerun
  • Delete
• Enable/disable schedule
• Schedule page
  • URLs
  • Check tables
• History page
  • URLs
  • Check tables
• Subreports
  • URLs
  • Check table