Merge health and social care works in national flu eligibility options (#440)

Reduced list of eligibility options from 8 to 7 by combining 'Healthcare
worker' and 'Social care worker' into: 'Health or social care worker'

The "What is their role?" question now asked whenever 'Health or social
care worker' is selected:

<img width="729" height="499" alt="Screenshot 2025-08-28 at 13 14 22"
src="https://github.com/user-attachments/assets/6cf10611-7220-4846-b10d-3b623d010ea1"
/>

---------

Co-authored-by: Frankie Roberto <[email protected]>
Co-authored-by: Frankie Roberto <[email protected]>

Author: Anna-Sutton

app/routes/record-vaccinations.js

@@ -563,7 +563,7 @@ module.exports = router => {
       }
 
     } else if (data.vaccine == "flu") {
-      if (data.eligibility === "Healthcare worker") {
+      if (data.eligibility === "Health or social care worker") {
         nextPage = "/record-vaccinations/healthcare-worker"
       } else {
         nextPage = "/record-vaccinations/patient"

app/views/record-vaccinations/eligibility.html

@@ -21,12 +21,11 @@
 
 {% set NationalFluEligibilityOptions = [
   "Based on age",
-  "Healthcare worker",
+  "Health or social care worker",
   "Pregnant",
   "In a clinical risk group",
   "Resident in a care home",
   "Carer",
-  "Social care worker",
   "Household contact of someone immunosuppressed"
 ] %}