[TASK] Allow to disable components in Identity auth

[aabouzaid]

Describe the use case:

At the moment, we don't have a mechanism to disable the auth sections in Identity because of the limitation of Helm sub-charts (the sub-charts cannot access each other), which means even if one of the components is disabled (e.g., Connectors), its config is still existing in Identity which confusing especially during the upgrade process (the disabled component password should be preserved even it's not used).

Describe the enhancement/feature:

Un till we have all components in the parent chart (flat structure), introduce a new key global.identity.auth.*.enabled to deal with that limitation (the downside is that the disabled app should be disabled in 2 places, the chart and in the Identity section).

In the future, when we move the rest of the components to the flat chart, we will overcome the downside mentioned above.

Desired outcome and acceptance tests:

• It should be possible to disable component setup as well as in Identity.

Relevant support cases:
https://jira.camunda.com/browse/SUPPORT-20659

[felix-mueller]

Related to support: https://jira.camunda.com/browse/SUPPORT-16866

[aabouzaid]

There is a lot of yak shaving in this task, and we still need to enhance the Identity structure; otherwise, it will add more complexity, and it will be harder to tackle in the future (I will try to have those changes as an epic for 8.5 in April).