Address auth ALC review comments

Author: PrzemyslawKlys

src/Authentication/Authentication/Microsoft.Graph.Authentication.psm1

@@ -53,7 +53,7 @@ namespace Microsoft.Graph.PowerShell.Authentication.Loader
 
         private static Assembly Resolve(AssemblyLoadContext context, AssemblyName assemblyName)
         {
-            if (context == null || assemblyName == null)
+            if (context == null || assemblyName == null || string.IsNullOrWhiteSpace(assemblyName.Name))
             {
                 return null;
             }
@@ -91,7 +91,7 @@ function Import-GraphAuthenticationAssembly {
     )
 
     if ($PSEdition -ne 'Core' -or -not ('System.Runtime.Loader.AssemblyLoadContext' -as [type])) {
-        return Import-Module -Name $ModulePath -PassThru
+        return Import-Module -LiteralPath $ModulePath -PassThru
     }
 
     $loadContextName = Get-GraphAuthenticationLoadContextName -ModulePath $ModulePath

src/Authentication/Authentication/test/Microsoft.Graph.Authentication.Tests.ps1

@@ -117,9 +117,7 @@ public static class GraphAuthenticationAssemblyLoadContextTestHelper
 
             $dependencyAssembly.GetName().Name | Should -Be 'Azure.Core'
             $dependencyContext.Name | Should -Be $loadContext.Name
-            [System.Runtime.Loader.AssemblyLoadContext]::Default.Assemblies |
-                Where-Object { $_.GetName().Name -eq 'Azure.Core' } |
-                Should -BeNullOrEmpty
+            [object]::ReferenceEquals($dependencyContext, [System.Runtime.Loader.AssemblyLoadContext]::Default) | Should -BeFalse
         }
     }
 }