[BUG] DefaultAzureCredential AzurePowerShellCredential fails with AuthenticationFailedException when not logged in

[jongio]

Describe the bug

Using DAC.

Fails with:

"Azure PowerShell authentication failed due to an unknown error. #< CLIXML\r\n<Objs Version=\"1.1.0.1\" xmlns=\"http://schemas.microsoft.com/powershell/2004/04\"><S S=\"Error\">_x001B_[91mGet-AzAccessToken: _x000D__x000A_</S><S S=\"Error\">_x001B_[96mLine |_x000D__x000A_</S><S S=\"Error\">_x001B_[96m  12 | _x001B_[0m $token = _x001B_[96mGet-AzAccessToken -ResourceUrl 'https://vault.azure.net'_x001B_[0m_x000D__x000A_</S><S S=\"Error\">_x001B_[96m     | _x001B_[91m          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~_x000D__x000A_</S><S S=\"Error\">_x001B_[91m_x001B_[96m     | _x001B_[91mCannot retrieve access token for resource 'https://vault.azure.net';. Please ensure that you have provided the appropriate access tokens when using access token login._x001B_[0m_x000D__x000A_</S></Objs>"

Expected behavior

If PSH fails I expect it to bubble up with the normal aggregated DAC exception.

I think we should make sure we have a test that covers "Has AzPSH installed, but not logged in"

Actual behavior (include Exception or Stack Trace)

Right now it fails and throws an exception.

To Reproduce
Steps to reproduce the behavior (include a code snippet, screenshot, or any additional information that might help us reproduce the issue)

1. Log out of all dev tools - including PowerShell
2. New up a DAC
3. Run it.
4. Get the exception

Environment:

• Name and version of the Library package used: [e.g. Azure.Storage.Blobs 12.2.0]

    <PackageReference Include="Azure.Identity" Version="1.5.0-beta.3"/>
    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.3.0-beta.1"/>

I also tried with the GA version.

❯ $PSVersionTable.PSVersion

Major  Minor  Patch  PreReleaseLabel BuildLabel
-----  -----  -----  --------------- ----------
7      1      4

• Hosting platform or OS and .NET runtime version (dotnet --info output for .NET Core projects): [e.g. Azure AppService or Windows 10 .NET Framework 4.8]

Windows 10

• IDE and version : [e.g. Visual Studio 16.3]

VS Code

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