[Due for payment 2025-06-11] Attendee tracking feature should be a sub-category of 'Rules'

[Julesssss]

A part of collect v2

Summary of changes

• Make attendee tracking a feature that can be enabled/disabled via a toggle
• Make it restricted to Control policies, by placing the toggle in the Rules section of the workspace editor (which can only be accessed after upgrading)

• Text to use below the toggle: Track the per-person cost for every expense.

Initial discussion here (internal).

Technical changes

1. Backend

   • Create a new API command SetPolicyAttendeeTrackingEnabled that takes a policyID: string and enabled: boolean
   • Set the enabled state of the feature as a new policy attribute isAttendeeTrackingEnabled
   • https://github.com/Expensify/Expensify/issues/504051

2. Frontend

   • Update onyx/Policy.ts with a new prop isAttendeeTrackingEnabled?: boolean
   • Add a toggle to enable or disable Attendee Tracking in the Rules section of the workspace editor, under the existing eReceipts toggle
     • For backwards compatibility, assume the feature is disabled if the prop isAttendeeTrackingEnabled doesn't exist
     • Use the new API command SetPolicyAttendeeTrackingEnabled when toggling the option, with optimistic data
   • Update shouldShowAttendees to only show the attendee selector when the feature is enabled on the selected workspace

3. Backend (can be done as follow-up updates)

   1. Update commands to throw an error if trying to set/edit attendees on a collect policy expense
   2. Disable the flag after downgrading a policy
   3. Prevent from enabling the feature on collect policies

[dylanexpensify]

@Julesssss assigning you for this for now, but feel free to assign someone else if need be!

[Julesssss]

Project is held

[Julesssss]

Project remains held