chore: import upstream snapshot with attribution

.github/pipelines/promptflow-csharp-e2e-test-env-setup.yml

@@ -0,0 +1,55 @@
+parameters:
+- name: promptflowCsPat
+  displayName: "PAT to clone csharp repository"
+  type: string
+- name: flowProjectRelativePath
+  displayName: "Flow Project Relative Path"
+  type: string
+
+steps:
+  - task: UseDotNet@2
+    inputs:
+      version: '6.x'
+  - task: UsePythonVersion@0
+    inputs:
+      versionSpec: '3.9.x'
+      architecture: 'x64'
+
+  - task: PowerShell@2
+    displayName: 'Install promptflow cli'
+    inputs:
+      targetType: 'inline'
+      script: |
+        Set-PSDebug -Trace 1
+        pip install -r src/promptflow/dev_requirements.txt
+        pip install src/promptflow-tracing
+        pip install src/promptflow-core[executor-service]
+        pip install src/promptflow-devkit
+        pip install src/promptflow-azure
+        pip install src/promptflow-recording
+        pip freeze
+
+  - task: PowerShell@2
+    displayName: 'Clone csharp repository'
+    inputs:
+      targetType: 'inline'
+      script: |
+        git clone https://$(PROMPTFLOW_CS_PAT)@dev.azure.com/msdata/Vienna/_git/PromptflowCS csharp
+
+  - task: NuGetAuthenticate@1
+
+  - task: DotNetCoreCLI@2
+    inputs:
+      command: 'restore'
+      projects: '$(flowProjectRelativePath)/**/*.csproj'
+      feedsToUse: 'config'
+      nugetConfigPath: '$(flowProjectRelativePath)/nuget.config'
+    displayName: 'dotnet restore'
+
+  - task: DotNetCoreCLI@2
+    inputs:
+      command: 'build'
+      projects: '$(flowProjectRelativePath)/**/*.csproj'
+      feedsToUse: 'config'
+      nugetConfigPath: '$(flowProjectRelativePath)/nuget.config'
+    displayName: 'dotnet build'