[ENHANCEMENT] Execution Identity integration - iteration 3

[drodriguez-305]

Describe the use case:

This feature request is about integrating the execution layer identity into a SM cluster. Execution Identity is a new component that is part of the mono-repo https://github.com/camunda/camunda and will be the component to manager uses/authorizations within a cluster going forward and replace the current present identity component.

For more context, also see https://docs.google.com/presentation/d/1VcdJGDqX4Jcjt7w2gf7KvEyLUueHojmg4wxfcZPJoDI/edit#slide=id.g21c05d33edd_0_0

relates to https://github.com/camunda/product-hub/issues/2222

first iteration was completed #2195
second iteration was completed #2294

Describe the enhancement/feature:

Iteration 3- Migration App - TBD by @Ben-Sheppard

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1. Add a draft title or issue reference here

[Zelldon]

@drodriguez-305 I try to provide some more details next week regarding this, as we made goo progress on the application side