Only checkout PerfAutomation from azure-sdk-tools - Other files in azure-sdk-tools repo are unnecessary - Unnecessary checkout hurts perf and increases security footprint (#43581)

Co-authored-by: Mike Harder <mharder@microsoft.com>

Author: azure-sdk

eng/common/pipelines/templates/jobs/perf.yml

@@ -105,9 +105,16 @@ jobs:
       - Name: ${{ parameters.LanguageRepoName }}
         Commitish: ${{ parameters.LanguageRepoCommitish }}
         WorkingDirectory: $(System.DefaultWorkingDirectory)
+
+  - template: /eng/common/pipelines/templates/steps/sparse-checkout.yml
+    parameters:
+      Paths:
+      - 'tools/perf-automation/Azure.Sdk.Tools.PerfAutomation'
+      Repositories:
       - Name: Azure/azure-sdk-tools
         Commitish: ${{ parameters.ToolsRepoCommitish }}
         WorkingDirectory: $(System.DefaultWorkingDirectory)/azure-sdk-tools
+      SkipCheckoutNone: true
 
   - template: /eng/common/pipelines/templates/steps/verify-agent-os.yml
     parameters: