chore: remove the publish step for rc flow

azure-pipelines/cd.yml

@@ -62,11 +62,3 @@ steps:
     condition: and(succeeded(), eq(variables['is_r'], 'true'), eq(variables['Agent.OS'], 'Linux'))
     env:
       MARKETPLACE_TOKEN: $(vsciot_marketplace_token)
-
-  # publish vsix to marketplace for release candidates
-  - bash: yes | vsce unpublish -p $MARKETPLACE_TOKEN $(test_publisher).$(test_extension_name) && vsce publish -p $MARKETPLACE_TOKEN --packagePath *.vsix
-    workingDirectory: '$(Build.ArtifactStagingDirectory)'
-    displayName: Deploy release candidates to marketplace
-    condition: and(succeeded(), eq(variables['is_rc'], 'true'), eq(variables['Agent.OS'], 'Linux'))
-    env:
-      MARKETPLACE_TOKEN: $(iotdevexbuild_marketplace_token)