Use User Picker for PO, TLs

[junminahn]

Description

• Update the main contacts section for PO, TLs, and EA to align with the display style of additional team members.

Technical Details

• UI:

  • Display three placeholder rows for private cloud and four for public cloud.
  • A Remove button is available only for the second TL; all other rows are mandatory.
  • Since the user picker search already creates users in the database, include the user ID when updating products.

• Backend:

  • Remove the upsertUsers logic for users, as user IDs now exist during the search process.
  • Update the backend to reference user IDs directly instead of emails.

• Integration Tests:

  • Removing the upsertUsers methods will cause integration tests to fail.
  • Update the tests to create all users in advance and dynamically include their IDs in the test scripts.

Definition of Done (DOD)

• The contacts section manages users in the same way as additional team members.