`Get-SqlDscServerPermission`: Should be able to return permissions for a server role

[johlju]

Problem description

This is similar to issue #2061 that need to use the command addedin issue #2060 to evalaute if the principal is a role so that it can return permissions for server roles as well.

SqlServerDsc/source/Public/Get-SqlDscServerPermission.ps1

Lines 53 to 58 in 666ef4e

	$testSqlDscIsLoginParameters = @{
	ServerObject = $ServerObject
	Name = $Name
	}
	$isLogin = Test-SqlDscIsLogin @testSqlDscIsLoginParameters

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Expected behavior

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Current behavior

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Suggested solution

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Operating system the target node is running

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PowerShell version and build the target node is running

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