Use preinstalled .NET in CI runner

Author: Sergio0694

azure-pipelines.yml

@@ -13,32 +13,13 @@ pool:
 
 variables:
   Build.Configuration: Release
-  DotNet.Tools: $(Agent.ToolsDirectory)/dotnet
-  DotNet.Version: 7.0.x
 
 jobs:
 - job: BuildBits
   displayName: Build and Test solution
   timeoutInMinutes: 60
   steps:
 
-  # Cache .NET SDKs and Tools across pipeline runs
-  - task: Cache@2
-    displayName: Cache .NET SDKs
-    inputs:
-      key: 'dotnet | "$(Agent.OS)" | "$(DotNet.Version)"'
-      restoreKeys: |
-        dotnet | "$(Agent.OS)"
-        dotnet
-      path: $(DotNet.Tools)
-
-  # Install the .NET 7 SDK
-  - task: UseDotNet@2
-    displayName: Install the .NET 7 SDK
-    inputs:
-      version: $(DotNet.Version)
-      performMultiLevelLookup: true
-
   # Set Build Version
   - script: nbgv cloud
     displayName: Set NBGV version