Remove unnecessary pipeline tasks (#1290)

azure-pipelines/build.yml

@@ -18,31 +18,6 @@ steps:
   inputs:
     useGlobalJson: true
 
-- task: DotNetCoreCLI@1
-  displayName: 'dotnet restore sqltoolsservice.sln'
-  inputs:
-    command: restore
-    projects: '$(Build.SourcesDirectory)/sqltoolsservice.sln'
-    feedsToUse: config
-    nugetConfigPath: nuget.config
-
-- task: DotNetCoreCLI@2
-  displayName: 'dotnet build src/Microsoft.Kusto.ServiceLayer'
-  inputs:
-    projects: '$(Build.SourcesDirectory)/src/Microsoft.Kusto.ServiceLayer'
-
-- task: DotNetCoreCLI@2
-  displayName: 'dotnet build src/Microsoft.SqlTools.ServiceLayer --configuration Release'
-  inputs:
-    projects: '$(Build.SourcesDirectory)/src/Microsoft.SqlTools.ServiceLayer '
-    arguments: '--configuration Release'
-
-- task: DotNetCoreCLI@2
-  displayName: 'dotnet build src/Microsoft.Kusto.ServiceLayer --configuration Release'
-  inputs:
-    projects: '$(Build.SourcesDirectory)/src/Microsoft.Kusto.ServiceLayer'
-    arguments: '--configuration Release'
-
 - task: UseDotNet@2
   displayName: 'Installing dotnet 3.1 to run srgen (To be removed after srgen is updated)'
   inputs: