Remove Optimize 8 code from Optimize 7

[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)

All code that is only relevant for Optimize 8 is removed from the Optimize 7 codebase.

Breakdown

Tasks

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1. https://github.com/camunda/camunda-optimize/issues/12949
2. https://github.com/camunda/camunda-optimize/issues/12950
3. https://github.com/camunda/camunda-optimize/issues/12951
4. https://github.com/camunda/camunda-optimize/issues/12952
5. https://github.com/camunda/camunda-optimize/issues/13269
6. https://github.com/camunda/camunda-optimize/issues/13298
7. https://github.com/camunda/camunda-optimize/issues/13376
8. https://github.com/camunda/camunda-optimize/issues/13381
9. https://github.com/camunda/camunda-optimize/issues/13383
10. https://github.com/camunda/camunda-optimize/issues/13386
11. Opt 8 cleanup: Remove API to set initial process owner #4736
    scope:optimize type:task +2
12. Opt 8 cleanup: Remove webapps links from UIConfiguration API #4737
    potential:optimize 3.14.2 scope:optimize type:task version:optimize 3.15.0 +4
    
13. Opt 8 cleanup: Remove C8 license properties from UIConfiguration API #4738
    scope:optimize type:task +2
14. Opt 8 cleanup: Remove user token API #4739
    scope:optimize type:task +2
15. Opt 8 cleanup: Delete customer onboarding data generation #4740
    scope:optimize type:task +2
16. https://github.com/camunda/camunda-optimize/issues/13988
17. Remove C8 mentions from Optimie readme #4806
    scope:optimize type:task +2

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