[CIS Azure] Implement identity provider

[jeniawhite]

Motivation
We would like to have an identity provider, this is needed order to understand the scope of the credentials and what resources we are working on.
Sending this additional information to the index and populating the findings will give the user an additional layer of understanding.

Since we query the resources via subscription/s id/s and management group/s id/s and this information is not provided be default.

We either need to pull it with the help of an identity provider or assign it as part of the integration (user filled values that are being passed via agent configuration).

Definition of done
What needs to be completed at the end of this task

• Implement the provider and make sure that we have all of the needed identity information for population
• Utilize this provider to get the subscriptions, management groups as well

Out of scope
What should not be included in this task

Related tasks/epics
Reference related issues and epics

[jeniawhite]

Due to 8.11 time constraints, we've implemented partial needed features regarding identity:

• Azure: Populate cloud.account.name with DisplayName #1396
• Azure: Add missing ECS fields in events #1394
• Azure: Dynamically get subscription ID(s) #1366

This ticket needs to be re-evaluated for 8.12 release with the appropriate changes that are relevant for organizations.

[orestisfl]

We now have a provider for subs and mgs, should be complete after #1559

Please re-open if something is still missing.

[kfirpeled]

To verify this issue, follow the PRs mentioned above - self explanatory

Feel free to contact anyone on slack/here if you have questions

[opauloh]

Verified

Kibana 8.12.0
Commit 93cff0aacd70bd0835cd244348f742ba3cafc4aa