Replaced getMarketParticipantActorActorCredentials with graphql

[mimse]

https://app.zenhub.com/workspaces/raccoons-sprint-board-60d029726fc7570010362aa7/issues/zh/476

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Test results for \apps\dh\api-dh\source\DataHub.WebApi.Tests\bin\Release\net8.0\Energinet.DataHub.WebApi.Tests.dll

26 tests   26 :white_check_mark:  29s :stopwatch:  1 suites   0 :zzz:  1 files     0 :x:

Results for commit 0be2954a.

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