enable code coverage for aml runner (microsoft#297)

## Describe your changes
enable code coverage for aml runner
## Checklist before requesting a review
- [ ] Add unit tests for this change.
- [ ] Make sure all tests can pass.
- [ ] Update documents if necessary.
- [ ] Format your code by running `pre-commit run --all-files`

## (Optional) Issue link

.coveragerc

@@ -3,8 +3,6 @@ omit =
     olive/logging.py
     olive/passes/pytorch/pytorch_lightning_utils.py
     olive/passes/pytorch/qat_utils.py
-    olive/systems/azureml/aml_evaluation_runner.py
-    olive/systems/azureml/aml_pass_runner.py
     olive/systems/docker/eval.py
 
 [report]