Remove broken tempest-full-py3-opensuse15 job

tempest-full-py3-opensuse15 is failing all the time[1] and
opensuse is not tested/supported distro in testing runtime
or devstack anymore. So let's remove opensuse broken job from
tempest too.

Needed-By: https://review.opendev.org/c/openstack/tempest/+/816569

[1] https://zuul.opendev.org/t/openstack/builds?job_name=tempest-full-py3-opensuse15

Change-Id: I7b0363dc9bd759a3432c838e717c3f090afb887d

Author: Ghanshyam Mann

.zuul.yaml

@@ -601,8 +601,6 @@
         - devstack-plugin-nfs-tempest-full:
             irrelevant-files: *nova-base-irrelevant-files
         - nova-osprofiler-redis
-        - tempest-full-py3-opensuse15:
-            irrelevant-files: *nova-base-irrelevant-files
         - tempest-pg-full:
             irrelevant-files: *nova-base-irrelevant-files
         - nova-tempest-full-oslo.versionedobjects: