Resolves issue 1831, updates program_data.cve_website_update_date to behave as a date-only field.

[david-rocca]

Closes Issue #1831

Summary

This MR ensures program_data.cve_website_update_date is stored and returned without a time component. ISO date-time inputs are normalized to YYYY-MM-DD, while ambiguous month/day formats are rejected.

Important Changes

src/utils/dateOnly.js

• Added strict date-only normalization and validation helpers.
• Rejects ambiguous formats and invalid ISO dates.

src/model/baseorg.js

• Changed cve_website_update_date from Date to validated date-only string storage.

src/repositories/baseOrgRepository.js

• Normalizes the field before validation and on org response paths.

schemas/registry-org/*.json

• Updated registry org schemas from date-time to date.

test/integration-tests/registry-org/registryOrgCRUDTest.js

• Added coverage for date-only create/get behavior.
• Added coverage for dropping time from ISO date-time input.
• Added coverage for rejecting ambiguous dates.

Testing

• bash -i -c "npm run test:integration" passed with 416 passing.
• Create a registry org with program_data.cve_website_update_date: "2024-01-15" and verify the response returns "2024-01-15".
• Update with "2024-04-10T18:30:00.000Z" and verify the response returns "2024-04-10".
• Try "01/15/2024" and verify the API rejects it.