Add pipeline yaml and script

pipelines/azure-benchmarks.yml

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+stages:
+- stage: RunBenchmark
+  pool:
+    name: $(LINUXPOOL)
+    image: $(LINUXVMIMAGE)
+    os: linux
+  variables:
+  - template: /pipelines/templates/variables/image.yml
+  - template: /pipelines/templates/variables/globals.yml
+  jobs:
+  - job: RunBenchmark
+    displayName: 'Run Copilot Benchmarks'
+    steps:
+    - task: AzureCLI@2
+      displayName: 'Run Copilot Benchmarks script'
+      inputs:
+        azureSubscription: 'Azure SDK Engineering System'
+        scriptType: 'pscore'
+        scriptLocation: 'scriptPath'
+        scriptPath: $(Build.SourcesDirectory)/pipelines/scripts/Invoke-CopilotBenchmarks.ps1
+        arguments: >
+          -BuildId $(OfficialBuildId)

pipelines/scripts/Invoke-CopilotBenchmarks.ps1

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+param(
+    [string]$BuildId
+)
+
+Write-Host "Invoking Copilot Benchmarks for Build ID: $BuildId"

pipelines/templates/variables/globals.yml

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+variables:
+  OfficialBuildId: $(Build.BuildNumber)
+  skipComponentGovernanceDetection: true
+  nugetMultiFeedWarnLevel: 'none'
+  GDN_SUPPRESS_FORKED_BUILD_WARNING: true

pipelines/templates/variables/image.yml

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+# Default pool image selection. Set as variable so we can override at pipeline level
+
+variables:
+  - name: LINUXPOOL
+    value: azsdk-pool
+  - name: LINUXARMPOOL
+    value: azsdk-pool-arm64
+  - name: WINDOWSPOOL
+    value: azsdk-pool
+  - name: MACPOOL
+    value: Azure Pipelines
+
+  - name: LINUXVMIMAGE
+    value: ubuntu-24.04
+  - name: LINUXARMVMIMAGE
+    value: azure-linux-3-arm64
+  - name: WINDOWSVMIMAGE
+    value: windows-2022
+  - name: MACVMIMAGE
+    value: macos-latest
+
+  # Values required for pool.os field in 1es pipeline templates
+  - name: LINUXOS
+    value: linux
+  - name: WINDOWSOS
+    value: windows
+  - name: MACOS
+    value: macOS