Docs: add azure auth section to prometheus data source doc (#71491)

* added initial azure auth settings section

* updated with additional azure auth info
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@ -120,6 +120,22 @@ To connect the Prometheus data source to Amazon Managed Service for Prometheus u
If you run Grafana in an Amazon EKS cluster, follow the AWS guide to [Query using Grafana running in an Amazon EKS cluster](https://docs.aws.amazon.com/prometheus/latest/userguide/AMP-onboard-query-grafana-7.3.html).
## Azure authentication settings
The Prometheus data source works with Azure authentication. To configure Azure authentication see [Configure Azure Active Directory (AD) authentication](docs/grafana/latest/datasources/azure-monitor/#configure-azure-active-directory-ad-authentication).
In Grafana Enterprise, update the .ini configuration file: [Configure Grafana](https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/). Depending on your setup, the .ini file is located [here](/docs/grafana/latest/setup-grafana/configure-grafana/#configuration-file-location).
Add the following setting in the **[auth]** section :
```bash
[auth]
azure_auth_enabled = true
```
{{% admonition type="note" %}}
If you are using Azure authentication settings do not enable `Forward OAuth identity`. Both use the same HTTP authorization headers. Azure settings will get overwritten by the Oauth token.
{{% /admonition %}}
## Exemplars
Exemplars associate higher-cardinality metadata from a specific event with traditional time series data. See [Introduction to exemplars]({{< relref "../../fundamentals/exemplars/" >}}) in Prometheus documentation for detailed information on how they work.