[Cherry-pick][3.4ea1] fix: replace broken S3 cleanup with LlamaStack files API#1223

jgarciao merged 1 commit into3.4ea1opendatahub-io/opendatahub-tests:3.4ea1from

CherryPick-3.4ea1-c3f4opendatahub-io/opendatahub-tests:CherryPick-3.4ea1-c3f4Copy head branch name to clipboard