SSCSCI-2354: Fix isScottishCase not being set for bulk scan cases

[alext-justice]

Summary

• Add isScottishCase to SscsCaseValidator when RPC is set for paper/bulk scan cases
• Add backfill logic to CaseUpdatedAboutToSubmitHandler to set isScottishCase if empty when cases are updated
• Add tests for both fixes

Problem

Scottish cases created via bulk scan/paper appeals were not getting isScottishCase set because:

1. CreateCaseAboutToSubmitHandler excludes paper cases (receivedVia == "Paper")
2. Bulk scan flow in SscsCaseValidator sets regionalProcessingCenter but not isScottishCase

This resulted in only 3 out of 72 Glasgow cases having the isScottishCase flag set correctly.

Solution

1. Primary fix: Set isScottishCase in SscsCaseValidator when RPC is determined for bulk scan cases
2. Backfill fix: Update maybeChangeIsScottish to also set the flag when it's empty (not just when RPC changes), so existing cases get backfilled on next update

Test plan

• Unit tests added for SscsCaseValidator - Glasgow and non-Glasgow postcodes
• Unit tests added for CaseUpdatedAboutToSubmitHandler - backfill scenario
• All existing tests pass

🤖 Generated with Claude Code

[github-actions]

CCD diff report

No change

[github-actions]

Integration Tests results

   84 files  ±0     84 suites  ±0   11m 43s ⏱️ +26s
1 507 tests ±0  1 499 ✅ ±0  8 💤 ±0  0 ❌ ±0 
1 510 runs  ±0  1 502 ✅ ±0  8 💤 ±0  0 ❌ ±0 

Results for commit bd4bfe8. ± Comparison against base commit 15d1e8c.

This pull request removes 8 and adds 8 tests. Note that renamed tests count towards both.

uk.gov.hmcts.reform.sscs.bulkscan.controllers.SscsBulkScanExceptionRecordCallback ‑ [1] url=http://localhost:32953/transform-exception-record/, isAuto=false
uk.gov.hmcts.reform.sscs.bulkscan.controllers.SscsBulkScanExceptionRecordCallback ‑ [2] url=http://localhost:32953/transform-scanned-data/, isAuto=true
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenAppellantConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=granted, date=2026-03-10]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenAppellantConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=refused, date=2026-03-10]) [1]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyAndAppellantConfidentialityRequest_shouldSendBothConfidentialityLetters(DatedRequestOutcome[requestOutcome=granted, date=2026-03-10]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyAndAppellantConfidentialityRequest_shouldSendBothConfidentialityLetters(DatedRequestOutcome[requestOutcome=refused, date=2026-03-10]) [1]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=granted, date=2026-03-10]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=refused, date=2026-03-10]) [1]

uk.gov.hmcts.reform.sscs.bulkscan.controllers.SscsBulkScanExceptionRecordCallback ‑ [1] url=http://localhost:42299/transform-exception-record/, isAuto=false
uk.gov.hmcts.reform.sscs.bulkscan.controllers.SscsBulkScanExceptionRecordCallback ‑ [2] url=http://localhost:42299/transform-scanned-data/, isAuto=true
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenAppellantConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=granted, date=2026-03-11]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenAppellantConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=refused, date=2026-03-11]) [1]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyAndAppellantConfidentialityRequest_shouldSendBothConfidentialityLetters(DatedRequestOutcome[requestOutcome=granted, date=2026-03-11]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyAndAppellantConfidentialityRequest_shouldSendBothConfidentialityLetters(DatedRequestOutcome[requestOutcome=refused, date=2026-03-11]) [1]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=granted, date=2026-03-11]) [0]
uk.gov.hmcts.reform.sscs.tyanotifications.tya.NotificationItForReviewConfidentialityRequestTest ‑ givenJointPartyConfidentialityRequest_shouldSendConfidentialityLetter(DatedRequestOutcome[requestOutcome=refused, date=2026-03-11]) [1]

♻️ This comment has been updated with latest results.