DMP-4753: Handle NEWCASE event type

[Ben-Edwards-cgi]

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Change description

Summary of Git Diff

The provided Git Diff reflects changes made to two files in the project: CaseController.java and cases.yaml. The main modifications include the removal of a method from the CaseController class and the deletion of some API documentation from the OpenAPI specification file.

Highlights

CaseController.java

• Removed the casesPost method:
  • This method had been overridden and included security and authorization annotations.
  • The method's functionality to add a case was replaced by another method call.

cases.yaml

• Deleted the following sections from the OpenAPI specification:
  • The entire post operation for adding or updating a case, which included:
    • Request body details.
    • Various response descriptions (201, 400, 404, and 500).
• The 500 error response remains, but without the surrounding context provided by the removed post operation.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[X] No

[davet1985]

Can you amend the PR title please to state that it's removing an old endpoint?

[davet1985]

Are there any tests that need to be removed?

Please don't merge before hmcts/darts-gateway#716 is merged and deployed.