feat: Add By Participant view (M2-7798)

[farmerpaul]

• Tests for the changes have been added (in progress)
• Delivered the fix or feature branches into develop or release branches via Squash and Merge (to keep clean history)

📝 Description

🔗 Jira Ticket M2-7798

Note

I've selected the Activity Status Tags branch (#1937) as the target branch for this PR, which it is dependent on. Please review this work as if that branch were already merged to develop. I'll rebase and re-target this branch accordingly after #1937 has been merged.

This PR adds the By Participant view to the PDP, including:

• Support to call new API endpoint for By Participant view, /activities/applet/${appletId}/respondent/${subjectId}
• Empty states for By Participant view (full account, limited account)
• Adjustments to ActivityListItem component to support the new view

Also fixed some menu item logic to detect assignments correctly from the new view and handle disabled menu items properly for hidden activities/flows.

📸 Screenshots

Full Account/Team Member Empty State

Limited Account Empty State

List of Activities/Flows for which Participant is Respondent

🪤 Peer Testing

Tip

Ensure the enableActivityAssign feature flag is enabled in the environment you are testing from.

1. For a given Participant, ensure you have activities or flows created with these characteristics:
   • One that is manually assigned to the Participant as the Respondent
   • One that is auto-assigned to the Participant as the Respondent
   • One that is not assigned to the Participant, but has submissions for them as the Respondent (e.g., via Take Now, or via a previous assignment that as since been removed)
   • One that is hidden
2. From that Participant's PDP, ensure each of the activities/flows is listed in the By Participant view according to designs, taking into account the out-of-scope portions of the design as described in the AC of the ticket.
3. Create a new Limited Account and a new Full Account, and ensure there are no activities/flows that are auto-assigned.
4. Open the PDP > By Participant view for the Limited Account, and ensure the Limited Account empty state is shown.
5. Open the PDP > By Participant view for the Full Account, and ensure the Full Account empty state is shown.

[farmerpaul]

Closing in favour of #1941.