Remove extra "UseDotNet" task since latest SDK should be sufficient

Signed-off-by: Aliaksandr Kukrash <multiarc@gmail.com>

Author: multiarc

azure-pipelines.yml

@@ -53,11 +53,6 @@ stages:
             inputs:
               packageType: "sdk"
               version: 8.0.x
-          - task: UseDotNet@2
-            displayName: "Install .NET Core SDK"
-            inputs:
-              packageType: "sdk"
-              useGlobalJson: true
           - pwsh: "dotnet tool restore"
             displayName: "Dotnet Tool Restore"
             failOnStderr: true