DeleteService for deleting the self monitoring project

What does this MR do?

A service to delete the self-monitoring project and group.

The self-monitoring project ID is stored in the application_settings table. This service also deletes the self-monitoring project ID from the application_settings table.

Issue: #32351 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers