release: run nuget publish job on windows

The legacy NuGetCommand@2 task (used internally by the 1ES output: nuget
template) requires Mono on Linux. Recent updates to the ubuntu-x86_64-ado1es
image to Ubuntu 24.04+ removed Mono availability, breaking the publish step
with: "The task has failed because you are using Ubuntu 24.04 or later
without mono installed."

Move the nuget publish job to the win-x86_64-ado1es image so the task uses
the native nuget.exe and avoids the Mono dependency entirely. The same
Windows pool is already used by the dotnet_tool build job that produces
these packages.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>

Author: mjcheetham

.azure-pipelines/release.yml

@@ -872,9 +872,13 @@ extends:
             dependsOn: release_validation
             condition: and(succeeded(), eq('${{ parameters.nuget }}', true))
             pool:
+              # Run on Windows so the underlying NuGetCommand@2 task can use the
+              # native nuget.exe. On Ubuntu 24.04+ the legacy NuGet task fails
+              # because Mono is no longer available.
+              # See https://aka.ms/nuget-task-mono.
               name: GitClientPME-1ESHostedPool-intel-pc
-              image: ubuntu-x86_64-ado1es
-              os: linux
+              image: win-x86_64-ado1es
+              os: windows
             variables:
               version: $[dependencies.release_validation.outputs['version.value']]
             templateContext: