HDPI-5350: Respond to Claim confirmedSections enum field on DefendantResponses

[arun-hmcts]

Jira link

https://tools.hmcts.net/jira/browse/HDPI-5350

Change description

Adds List<RespondToClaimSection> confirmedSections to DefendantResponses
(citizen-access multi-select). The frontend writes to it when the citizen
clicks Save and continue on a section's CYA, then reads it back to
distinguish Done from In progress on the task-list hub.

Testing done

{
"caseLinks": [],
"possessionClaimResponse": {
"defendantResponses": {
"freeLegalAdvice": "NO",
"confirmedSections": [
"START_NOW_AND_DETAILS"
]
},
"defendantContactDetails": {
"party": {
"address": {},
"nameKnown": "NO",
"addressKnown": "NO"
}
}
}
}

Security Vulnerability Assessment

CVE Suppression: Are there any CVEs present in the codebase (either newly introduced or pre-existing) that are being intentionally suppressed or ignored by this commit?

• Yes
• No

Checklist

• commit messages are meaningful and follow good commit message guidelines
• README and other documentation has been updated / added (if needed)
• tests have been updated / new tests has been added (if needed)
• Does this PR introduce a breaking change

[github-actions]

CCD diff summary

👉 Full report: https://github.com/hmcts/pcs-api/actions/runs/26217057720?check_suite_focus=true

ComplexTypes/2_DefendantResponses.json

Max	ListElementCode	ID	FieldTypeParameter	FieldType	ElementLabel
+	+completedSections	+DefendantResponses	+RespondToClaimSection	+MultiSelectList	+

FixedLists/TaskGroupId.json

ListElementCode	ListElement	ID
-DOCUMENTS	-DOCUMENTS	-TaskGroupId

FixedLists/RespondToClaimSection.json

ID	ListElement	ListElementCode
+RespondToClaimSection	+CHECK_YOUR_ANSWERS_AND_SUBMIT	+CHECK_YOUR_ANSWERS_AND_SUBMIT
+RespondToClaimSection	+DISPUTE_AND_TENANCY	+DISPUTE_AND_TENANCY
+RespondToClaimSection	+INCOME_AND_EXPENDITURE	+INCOME_AND_EXPENDITURE
+RespondToClaimSection	+PAYMENTS	+PAYMENTS
+RespondToClaimSection	+PERSONAL_DETAILS	+PERSONAL_DETAILS
+RespondToClaimSection	+SITUATION_AND_CIRCUMSTANCES	+SITUATION_AND_CIRCUMSTANCES
+RespondToClaimSection	+START_NOW_AND_DETAILS	+START_NOW_AND_DETAILS
+RespondToClaimSection	+UPLOAD_FILES	+UPLOAD_FILES