Remove descriptor_queues_flush_stress from testplan

There is number of tests that cancel transactions and inject errors at
different timesteps of the I3C frames.

Internal-tag: [#96476]

Author: robertszczepanski

verification/testplan/top/target.hjson

@@ -328,15 +328,6 @@
       tests: ["priv_write_tight_timing_sr"]
       tags: ["top"]
     }
-    {
-      name: descriptor_queues_flush_stress
-      desc:
-        '''
-        Force descriptor queues flushing by randomly cancelling transactions and injecting errors.
-        '''
-      tests: [""]
-      tags: ["top"]
-    }
     {
       name: push_pull_open_drain_check
       desc: