[ENHANCEMENT] In Optimize Configmap: Make api.audience configurable

[j-lindner]

Describe the use case:
Currently in Optimize ConfigMap (https://artifacthub.io/packages/helm/camunda/camunda-platform/10.0.5?modal=template&template=optimize/configmap.yaml) , there are 2 places, where audience is taken into account, once hardcoded and once configurable:

In environment-config.yaml: api.audience="optimize-api"
In application-ccsm.yaml: camunda.identity.audience={{ include "optimize.authAudience" . | quote }}

Describe the enhancement/feature:

api.audience also configurable

Desired outcome and acceptance tests:

[ManuelDittmar]

as a workaround, environment variable CAMUNDA_OPTIMIZE_IDENTITY_AUDIENCE should work.

see: https://github.com/camunda/camunda-optimize/blob/fa2c72e494218ab36b8f7fd0a6b5b716b84c47b4/backend/src/main/resources/application-ccsm.yaml#L8C17-L8C51

[aabouzaid]

Given there is a workaround for it and we don't have much capacity for now, also that part will be refactored anyway in the 8.7 release, I will put it back in the backlog.