Fix Windows ARM64 CI build: remove duplicate Release config

The job template appends \ to buildScript, so including
'Release' after '-c' resulted in 'dotnet build ... -c Release Release',
where the trailing 'Release' was interpreted as a project path (MSB1009).

Remove the explicit 'Release' so the template provides it, matching
the pattern used by the MacOS_arm64 job.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: alinpahontu2912

azure-pipelines.yml

@@ -93,7 +93,7 @@ jobs:
   parameters:
     prepScript: echo "no prep needed"
     name: Windows_arm64
-    buildScript: dotnet build /p:SkipCuda=true /p:TargetArchitecture=arm64 /p:SkipNetFxBuild=true -c Release
+    buildScript: dotnet build /p:SkipCuda=true /p:TargetArchitecture=arm64 /p:SkipNetFxBuild=true -c
     testScript: echo "Cannot run ARM64 tests on x64 Azure Pipelines agent"
     pool:
       vmImage: 'windows-latest'