Update end date prep for rtn req setup journey

On discussing what was needed to help the return requirements setup journey it was agreed we don't care about the reason, we just need the date value.

So, rather than adding the result as is from `myLicence.$ends()` instead we should just add the resulting date to the session.

app/services/return-requirements/initiate-return-requirement-session.service.js

@@ -45,11 +45,12 @@ async function _createSession (data) {
 
 function _data (licence, journey) {
   const { id, licenceDocument, licenceRef, licenceVersions } = licence
+  const ends = licence.$ends()
 
   return {
     licence: {
       id,
-      ends: licence.$ends(),
+      endDate: ends ? ends.date : null,
       licenceRef,
       licenceHolder: _licenceHolder(licenceDocument),
       startDate: _startDate(licenceVersions)

test/services/return-requirements/initiate-return-requirement-session.service.test.js

@@ -99,7 +99,6 @@ describe('Initiate Return Requirement Session service', () => {
           const { data } = result
 
           expect(data.licence.id).to.equal(licence.id)
-          expect(data.licence.ends).to.equal({ date: new Date('2024-08-10'), priority: 3, reason: 'expired' })
           expect(data.licence.licenceRef).to.equal(licence.licenceRef)
           expect(data.licence.licenceHolder).to.equal('Licence Holder Ltd')
         })
@@ -112,6 +111,14 @@ describe('Initiate Return Requirement Session service', () => {
           expect(data.licence.startDate).to.equal(new Date('2022-05-01'))
         })
 
+        it("creates a new session record containing the licence's end date", async () => {
+          const result = await InitiateReturnRequirementSessionService.go(licence.id, journey)
+
+          const { data } = result
+
+          expect(data.licence.endDate).to.equal(new Date('2024-08-10'))
+        })
+
         it('creates a new session record containing the journey passed in', async () => {
           const result = await InitiateReturnRequirementSessionService.go(licence.id, journey)
 
@@ -143,7 +150,6 @@ describe('Initiate Return Requirement Session service', () => {
           const { data } = result
 
           expect(data.licence.id).to.equal(licence.id)
-          expect(data.licence.ends).to.equal({ date: new Date('2024-08-10'), priority: 3, reason: 'expired' })
           expect(data.licence.licenceRef).to.equal(licence.licenceRef)
           expect(data.licence.licenceHolder).to.equal('Luce Holder')
         })
@@ -156,6 +162,14 @@ describe('Initiate Return Requirement Session service', () => {
           expect(data.licence.startDate).to.equal(new Date('2022-05-01'))
         })
 
+        it("creates a new session record containing the licence's end date", async () => {
+          const result = await InitiateReturnRequirementSessionService.go(licence.id, journey)
+
+          const { data } = result
+
+          expect(data.licence.endDate).to.equal(new Date('2024-08-10'))
+        })
+
         it('creates a new session record containing the journey passed in', async () => {
           const result = await InitiateReturnRequirementSessionService.go(licence.id, journey)