[CI] Azdo: Install az cli for running tests on helix/Windows

```
System.InvalidOperationException: Step 'provision-env' failed: Exception of type 'Aspire.Hosting.Azure.AzureCliNotOnPathException' was thrown.
|  ---> Aspire.Hosting.Azure.AzureCliNotOnPathException: Exception of type 'Aspire.Hosting.Azure.AzureCliNotOnPathException' was thrown.
|    at Aspire.Hosting.Azure.Provisioning.Internal.BicepCliCompiler.CompileBicepToArmAsync(String bicepFilePath, CancellationToken cancellationToken) in /_/src/Aspire.Hosting.Azure/Provisioning/Internal/BicepCompiler.cs:line 41
|    at Aspire.Hosting.Azure.Provisioning.BicepProvisioner.GetOrCreateResourceAsync(AzureBicepResource resource, ProvisioningContext context, CancellationToken cancellationToken) in /_/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs:line 159
|    at Aspire.Hosting.Azure.AzureBicepResource.ProvisionAzureBicepResourceAsync(PipelineStepContext context, AzureBicepResource resource) in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 338
|    at Aspire.Hosting.Azure.AzureBicepResource.ProvisionAzureBicepResourceAsync(PipelineStepContext context, AzureBicepResource resource) in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 361
|    at Aspire.Hosting.Azure.AzureBicepResource.ProvisionAzureBicepResourceAsync(PipelineStepContext context, AzureBicepResource resource) in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 361
|    at Aspire.Hosting.Azure.AzureBicepResource.<>c__DisplayClass0_0.<<-ctor>b__2>d.MoveNext() in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 53
| --- End of stack trace from previous location ---
|    at Aspire.Hosting.Pipelines.DistributedApplicationPipeline.ExecuteStepAsync(PipelineStep step, PipelineStepContext stepContext) in /_/src/Aspire.Hosting/Pipelines/DistributedApplicationPipeline.cs:line 760
|    --- End of inner exception stack trace ---
|    at Aspire.Hosting.Pipelines.DistributedApplicationPipeline.ExecuteStepAsync(PipelineStep step, PipelineStepContext stepContext) in /_/src/Aspire.Hosting/Pipelines/DistributedApplicationPipeline.cs:line 765
|    at Aspire.Hosting.Pipelines.DistributedApplicationPipeline.<>c__DisplayClass18_0.<<ExecuteStepsAsTaskDag>g__ExecuteStepWithDependencies|0>d.MoveNext() in /_/src/Aspire.Hosting/Pipelines/DistributedApplicationPipeline.cs:line 576
```

Author: radical

tests/helix/send-to-helix-basictests.targets

@@ -7,6 +7,8 @@
     <!-- needed to run 9.0 tests on helix -->
     <NeedsSdksForTesting>true</NeedsSdksForTesting>
     <IncludeDotNetCli>false</IncludeDotNetCli>
+    <!-- Enable Azure CLI for basic tests -->
+    <NeedsAzCli>true</NeedsAzCli>
 
     <TargetFrameworkSuffixRegex>^(.*?)(-net[\d.]+)?$</TargetFrameworkSuffixRegex>
   </PropertyGroup>

tests/helix/send-to-helix-inner.proj

@@ -22,7 +22,11 @@
     <_AzureFunctionsCliUrl Condition="'$(OS)' == 'Windows_NT'">https://github.com/Azure/azure-functions-core-tools/releases/download/4.0.7512/Azure.Functions.Cli.min.win-x64.4.0.7512.zip</_AzureFunctionsCliUrl>
     <_AzureFunctionsCliUrl Condition="'$(OS)' != 'Windows_NT'">https://github.com/Azure/azure-functions-core-tools/releases/download/4.0.7512/Azure.Functions.Cli.linux-x64.4.0.7512.zip</_AzureFunctionsCliUrl>
 
+    <!-- Azure CLI URL for Helix runs - Windows x64 zip version -->
+    <_AzureCliWindowsUrl Condition="'$(OS)' == 'Windows_NT'">https://aka.ms/installazurecliwindowszipx64</_AzureCliWindowsUrl>
+
     <_DefaultSdkDirNameForTests>dotnet-tests</_DefaultSdkDirNameForTests>
+    <BuildHelixWorkItemsDependsOn>$(BuildHelixWorkItemsDependsOn);DownloadAzureCliForHelix</BuildHelixWorkItemsDependsOn>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -165,6 +169,28 @@
 
   <Target Name="PrepareDependencies" DependsOnTargets="$(PrepareDependenciesDependsOn)" />
 
+  <!--
+    The file downloaded from the url doesn't have an extension, which causes Helix sdk to not
+    treat it as a zip file even when AsArchive=true is used.
+    So, we explicitly download and rename it to az-cli.zip before adding to HelixCorrelationPayload.
+  -->
+  <Target Name="DownloadAzureCliForHelix" Condition="'$(NeedsAzCli)' == 'true' and '$(OS)' == 'Windows_NT'">
+    <DownloadFile
+          SourceUrl="$(_AzureCliWindowsUrl)"
+          DestinationFolder="$(ArtifactsBinDir)">
+      <Output TaskParameter="DownloadedFile" ItemName="_AzureCliArchive" />
+    </DownloadFile>
+
+    <Move SourceFiles="@(_AzureCliArchive)" DestinationFiles="$(ArtifactsBinDir)\az-cli.zip" />
+
+    <ItemGroup>
+      <HelixCorrelationPayload Include="$(ArtifactsBinDir)\az-cli.zip" Destination="az-cli" AsArchive="true" />
+      <HelixPreCommand Include="set PATH=%HELIX_CORRELATION_PAYLOAD%\az-cli\bin%3B%PATH%" />
+      <HelixPreCommand Include="az --version" />
+    </ItemGroup>
+
+  </Target>
+
   <Target Name="BuildHelixWorkItems" DependsOnTargets="$(BuildHelixWorkItemsDependsOn)" BeforeTargets="Build">
     <MSBuild Projects="$(RepoRoot)\eng\dcppack\Aspire.Hosting.Orchestration.$(NETCoreSdkRuntimeIdentifier).csproj" Targets="GetDCPBinaryLocation">
       <Output TaskParameter="TargetOutputs" PropertyName="DCPBinaryLocation" />