[Ci] clean up the old artifacts in the agent before downloading the new artifacts (#12391)

Ci] clean up the old artifacts in the agent before downloading the new artifacts

.azure-pipelines/run-test-template.yml

@@ -27,6 +27,10 @@ steps:
   clean: true
   displayName: 'checkout sonic-mgmt repo'
 
+- script: |
+    sudo rm -rf ../target
+  displayName: "Cleanup"
+
 - task: DownloadPipelineArtifact@2
   inputs:
     artifact: sonic-buildimage.vs

azure-pipelines.yml

@@ -98,6 +98,11 @@ stages:
       submodules: recursive
       displayName: 'Checkout code'
 
+    - script: |
+        sudo rm -rf ../target
+        sudo rm -rf ../*.deb
+      displayName: "Cleanup"
+
     - task: DownloadPipelineArtifact@2
       inputs:
         source: specific