qa/cephfs: reject ceph-fuse upgrade jobs to reduce failure noise

Subsequent commit will introduce a dedicated ceph-fuse upgrade
sub-suite (under fs:upgrade) to still keep track of failing
jobs.

Fixes: http://tracker.ceph.com/issues/76780
Signed-off-by: Venky Shankar <vshankar@redhat.com>

qa/suites/fs/upgrade/mds_upgrade_sequence/tasks/2-client/fuse.yaml

@@ -1,3 +1,9 @@
+teuthology:
+  postmerge:
+  - |
+    -- Tracker #76780: Drop this entire branch. 
+    -- FUSE upgrade testing is being moved to a separate dedicated job.
+    reject()
 tasks:
 - ceph-fuse:
 - print: "**** done client"

qa/suites/fs/upgrade/upgraded_client/tasks/2-clients/fuse-upgrade.yaml

@@ -1,6 +1,9 @@
 teuthology:
   postmerge:
-    - if not is_fuse() then reject() end
+  - |
+    -- Tracker #76780: Drop this entire branch. 
+    -- FUSE upgrade testing is being moved to a separate dedicated job.
+    reject()
 tasks:
 - ceph-fuse:
     client.0: