allow coverage xml to fail, leading to yellow build (#5503)

Setting `continueOnError` for coverage publishing in Mitche's CI.yml stuff.

Author: scbedd

eng/pipelines/templates/jobs/archetype-sdk-client.yml

@@ -154,14 +154,17 @@ jobs:
       - script: |
           coverage xml
         displayName: 'Generate Coverage XML'
+        continueOnError: true
 
       - script: |
           codecov -t $(codecov-python-repository-token)
         displayName: 'Publish Code Cov'
+        continueOnError: true
         condition: ne(variables['codecov-python-repository-token'], '')
 
       - task: PublishCodeCoverageResults@1
         displayName: 'Publish Code Coverage to DevOps'
+        continueOnError: true
         inputs:
           codeCoverageTool: Cobertura
           summaryFileLocation: '$(Build.SourcesDirectory)/coverage.xml'