[Windows] Install Docker-wincred (#4540)

* Add Docker WinCred

* fix getting docker url

* Use Expand-Archive instead of Extract-7Zip since 7zip is not installed yet

images/win/scripts/Tests/Docker.Tests.ps1

@@ -6,6 +6,10 @@ Describe "Docker" {
         "$ToolName --version" | Should -ReturnZeroExitCode
     }
 
+    It "docker-wincred" {
+        "docker-credential-wincred version" | Should -ReturnZeroExitCode
+    }
+
     It "docker service is up" {
         "docker images" | Should -ReturnZeroExitCode
     }