[PowerShell] Stop the Get-AzAccessToken breaking changes warning

[flanakin]

⚠️ Problem

All PowerShell commands are returning the following warning:

WARNING: Upcoming breaking changes in the cmdlet 'Get-AzAccessToken' :
The Token property of the output type will be changed from String to SecureString. Add the [-AsSecureString] switch to avoid the impact of this upcoming breaking change.

• The change is expected to take effect in Az version : '13.0.0'
• The change is expected to take effect in Az.Accounts version : '4.0.0'
  Note : Go to https://aka.ms/azps-changewarnings for steps to suppress this breaking change warning, and other information on breaking changes in Azure PowerShell.

Start-FinOpsCostExport is even more noisy since there are multiple calls.

🛠️ Solution

Figure out how to avoid this warning. We are using -AsSecureString, so the warning is a false positive.

🙋‍♀️ Ask for the community

We could use your help:

1. Please vote this issue up (👍) to prioritize it.
2. Leave comments to help us solidify the vision.