remove service-type-authority tox job
The legacy job is now in-tree, remove it.
Depends-On:
check:
jobs:
- openstack-tox-pep8
- - legacy-service-types-authority-validate
gate:
jobs:
- openstack-tox-pep8
- - legacy-service-types-authority-validate
post:
jobs:
- propose-updates:
