Create Keycloak plugin for user delete event

[db-ot]

Description

User Stories

• As an admin, I want a technical solution that reacts at delete events, so that user data stays synchronized across systems without manual intervention.

Value

• Supports seamless data synchronization
• Enables efficient and scalable user data handling

Acceptance Criteria

• see possible solution in the overall ticket and discuss

Definition of ready

• [ ] Everybody needs to understand the value written in the user story
• [ ] Acceptance criteria have to be defined
• [ ] All dependencies of the user story need to be identified
• [ ] Feature should be seen from an end user perspective
• [ ] Story has to be estimated
• [ ] Story points need to be less than 20

Definition of done

• Functional requirements
  • [ ] Functionality described in the user story works
  • [ ] Acceptance criteria are fulfilled
• Quality
  • [ ] Code review happened
  • [ ] CI is green (that includes new and existing automated tests)
  • [ ] Critical code received unit tests by the developer
• Non-functional requirements
  • [ ] No sonar cloud issues
• Configuration changes
  • [ ] The next branch of the OpenCloud charts is compatible