Save log files from test proxy for diagnosis (Azure#35127)

Author: billwert

eng/pipelines/templates/jobs/ci.tests.yml

@@ -93,3 +93,5 @@ jobs:
           TestOptions: ${{ parameters.TestOptions }}
           TestParallelization: ${{ parameters.TestParallelization }}
           BuildParallelization: ${{ parameters.BuildParallelization }}
+
+      - template: /eng/common/testproxy/publish-proxy-logs.yml