Fix for Azure Service Principals who have no permission to access the Graph API

[SvenTo]

Data collection with azurehound does not work for Azure Service Principals who have no permission to access the Graph API because calling client.GetAzureADOrganization() fails. However, collecting information from the Azure Resource Manager is still possible.

This pull request implements a bugfix so that you can use commands like list az-rm with those Service Principals.

Sample output:

$ ./azurehound list az-rm -v 2 -a "[REDACTED]" --secret "[REDACTED]" -t "[REDACTED]" -o "az-rm.json" --log-file az-rm.log --json
AzureHound 2379ab55f4a5c12ed2cae977ab33a2d59f5a0192
Created by the BloodHound Enterprise team - https://bloodhoundenterprise.io

No configuration file located at [REDACTED]/.config/azurehound/config.json
{"level":"debug","time":"2023-05-05T16:49:27+02:00","message":"Log File: az-rm.log"}
{"level":"debug","time":"2023-05-05T16:49:27+02:00","message":"testing connections"}
{"level":"debug","time":"2023-05-05T16:49:27+02:00","message":"testing connections"}
{"level":"trace","targetUrl":"https://login.microsoftonline.com","time":"2023-05-05T16:49:27+02:00","message":"dialing..."}
{"level":"trace","targetUrl":"https://graph.microsoft.com","time":"2023-05-05T16:49:27+02:00","message":"dialing..."}
{"level":"trace","targetUrl":"https://management.azure.com","time":"2023-05-05T16:49:27+02:00","message":"dialing..."}
{"level":"error","error":"map[error:map[code:Authorization_RequestDenied innerError:map[client-request-id:[REDACTED] date:2023-05-05T14:49:27 request-id:[REDACTED]] message:Insufficient privileges to complete the operation.]]","time":"2023-05-05T16:49:27+02:00","message":"unable to get Azure AD organization. It is likely that your user don't have directory reader permissions. If you list non AAD objects (e.g., az-rm) this should be okay."}
{"level":"info","time":"2023-05-05T16:49:27+02:00","message":"collecting azure resource management objects..."}
{"level":"info","time":"2023-05-05T16:49:27+02:00","message":"finished listing all subscription user access admins"}
{"level":"info","time":"2023-05-05T16:49:27+02:00","message":"finished listing all container registries"}
{"level":"info","time":"2023-05-05T16:49:27+02:00","message":"finished listing all virtual machine role assignments"}
{"level":"info","time":"2023-05-05T16:49:27+02:00","message":"finished listing all automation accounts"}
[...]

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[ddlees]

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