This tasks file was removed when we rewrote the gitea management into
python. Unfortunately our gitea rename project tasks rely on this tasks
file to create new orgs if they are needed to rename a project.
Restore this file so that we can rename projects in this manner. Note we
move it into playbooks/ and rename it to gitea-rename-setup-org.yaml to
make it clear that the gitea management role doesn't use this set of
tasks, only the gitea project rename playbook does.
Change-Id: I782f6e56cad18bdcbf9504d51af15caa950a5752
