[CBM] The "username/password" Service Principal authentication method for Azure is missing one required environment variable

What is the issue?
Currently the "username/password" Service Principal authentication method for Azure is missing the AZURE_TENANT_ID environment variable. Looking at the new Azure SDK code, this variable is required for all Service Principal authentication methods:

// NewEnvironmentCredential creates an EnvironmentCredential. Pass nil to accept default options.

func NewEnvironmentCredential(options *EnvironmentCredentialOptions) (*EnvironmentCredential, error) {

	if options == nil {

		options = &EnvironmentCredentialOptions{}

	}

	tenantID := os.Getenv("AZURE_TENANT_ID")

	if tenantID == "" {

		return nil, errors.New("missing environment variable AZURE_TENANT_ID")

	}

...

but in the SDK library's documentation it is not listed: https://pkg.go.dev/github.com/Azure/azure-sdk-for-go/sdk/azidentity#section-readme

We need to update our documentation to reflect the real required environment variables and not the ones documented.