Remove Artifactory cleanup playbook

This playbook was added 5 years ago in
664b016fa5.

It looks like this is not needed, as pointed out by James E. Blair in
https://review.opendev.org/c/zuul/zuul-jobs/+/946718

Depends-On: https://review.opendev.org/c/zuul/zuul-jobs/+/947685

Change-Id: Ice4f8cfe9c2be30af500a176986b61a57d137123

test-playbooks/artifactory/cleanup.yaml

@@ -1,4 +0,0 @@
-- hosts: all
-  tasks:
-    - name: Remove artifactory container
-      command: docker rm -f "{{ zuul.build }}"

zuul-tests.d/general-roles-jobs.yaml

@@ -708,7 +708,6 @@
       - roles/upload-artifactory/.*
       - test-playbooks/artifactory/.*
     run: test-playbooks/artifactory/run.yaml
-    cleanup-run: test-playbooks/artifactory/cleanup.yaml
 
 - job:
     name: zuul-jobs-test-upload-git-mirror