remove data-science-onramp samples (#10258)

Author: leahecole

.github/CODEOWNERS

@@ -97,7 +97,6 @@
 /bigquery/**/*                         @chalmerlowe @GoogleCloudPlatform/python-samples-reviewers
 /bigquery/remote_function/**/*         @autoerr @GoogleCloudPlatform/python-samples-reviewers
 /cloud-media-livestream/**/*           @GoogleCloudPlatform/cloud-media-team @GoogleCloudPlatform/python-samples-reviewers
-/data-science-onramp/                  @leahecole @bradmiro @GoogleCloudPlatform/python-samples-reviewers
 /dlp/**/*                              @GoogleCloudPlatform/googleapis-dlp @GoogleCloudPlatform/python-samples-reviewers
 /functions/spanner/*                   @GoogleCloudPlatform/api-spanner-python @GoogleCloudPlatform/functions-framework-google @GoogleCloudPlatform/python-samples-reviewers
 /healthcare/**/*                       @GoogleCloudPlatform/healthcare-life-sciences @GoogleCloudPlatform/python-samples-reviewers