feat: Submit response data identifier from Single Selection items (M2-8688)

[farmerpaul]

• Tests for the changes have been added

📝 Description

🔗 Jira Ticket M2-8688

This change updates function that evaluates what to send to the BE for the response data identifier (identifier string), supporting both Short Text and, now, Single Selection item types. It uses the value from the first item in the activity containing a response identifier, per existing behaviour.

🪤 Peer Testing

1. Create an activity containing a Single Selection item with Response Data Identifier checked. Assign it two options with labels Option 1 and Option 2.
2. Perform an assessment of that activity in the Web App, selecting Option 1, and submit your answers.
   Expected outcome: Answers should be submitted successfully.
3. Perform a second assessment, selecting Option 2, and submit your answers.
   Expected outcome: Answers should be submitted successfully.
4. In the Admin App, navigate to Dataviz for the respondent participant to view their submissions.
5. Adjust the filter date range to be only today's date.
6. Expand the More Filters section, then enable the Filter by identifier toggle:
   
7. Open the Response Identifier dropdown.
   Expected outcome: It should contain Option 1 and Option 2 as possible response identifiers.
8. Select the Option 1 response identifier from the dropdown.
   Expected outcome: Only your first submission should be shown.
9. Deselect the Option 1 response identifier and select the Option 2 response identifier.
   Expected outcome: Only your second submission should be shown.

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