[JN-TBD] Refactoring pre-enroll surveys

[devonbush]

DESCRIPTION (include screenshots, and mobile screenshots for participant UX)

Updates pre-enrollment surveys to be a survey type, rather than have a dedicated data model attribute. this refactor will need to be done in two stages in order to avoid downtime. Stage 1 (this PR) migrates existing pre-enroll surveys and updates the frontend to read the migrated versions, but does not remove the data fields. Stage 2 would remove the data field

The big advantage of this is an overall simplification of our data model, and corresponding improvements in the UX. For example, this gives us the ability to publish pre-enroll surveys individually, which we did not have before. the downside is that this no longer enforces that a study env can only have a single pre-enrollment survey, so we'll have to think about what that means

TO TEST: (simple manual steps for confirming core behavior -- used for pre-release checks)

1. redeploy apiParticipantApp
2. go to https://sandbox.demo.localhost:3001
3. join, confirm pre-enroll processes correctly.
4. redeploy apiAdminApp
5. go to https://localhost:3000/demo/studies/heartdemo/env/sandbox/forms
6. confirm you can view/edit/publish the pre-enroll survey

[sonarqubecloud]

Quality Gate passed

Issues
8 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud