Opt 8 cleanup: Remove API to set initial process owner

[PHWaechtler]

With https://github.com/camunda/camunda-optimize/issues/12594, we fork optimize into two versions. Since we moved Optimize 8 into the mono repo, the Optimize repo needs to be cleaned up from any code related to Optimize 8.

Acceptance Criteria (Required on creation)

API to set initial process owner is removed from BE, along with all related logic and dtos.

Hints

Initial owner is set using /initial-owner endpoint in ProcessOverviewRestService

Links

Sub task of https://github.com/camunda/camunda-optimize/issues/13807

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