dbus-dos-reply-time: Remove test

This test was created to verify some DBUS robustness patches that ended
up not being accepted upstream.

The downstream patches have been dropped since v2019 when we rebased to
Debian, so this test doesn't have value anymore.

Avoid random failures by removing it.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>

test-cases/dbus-dos-reply-time.yaml

-metadata:
-  name: dbus-dos-reply-time
-  format: "Apertis Test Definition 1.0"
-  image-types:
-    fixedfunction: [ armhf, arm64, amd64 ]
-    hmi:           [ armhf, amd64 ]
-    basesdk:       [ amd64 ]
-    sdk:           [ amd64 ]
-  image-deployment:
-    - APT
-    - OSTree
-  group: "common"
-  type: performance
-  exec-type: automated
-  priority: high
-  maintainer: "Apertis Project"
-  description: "Check the reply time of a few D-Bus method calls while dbus-daemon
-                is loaded by D-Bus traffic. Different patterns of D-Bus loads are
-                tested: 
-                  1) A connection calling a D-Bus method repetitively.
-                  2) A process calling a D-Bus method repetitively using a
-                     different connection each time to generate traffic related to
-                     connections joining and leaving the bus (NameOwnerChanged
-                     signals).
-                  3) The same with 100 threads generating traffic.
-                  4) Tens of threads registering hundreds of D-Bus match rules 
-
-                DoS resistance is part of strategic basic services functionality."
-
-  expected:
-    - "There should be no error and it should show the time taken for every
-       command."
-    - |
-        >>>> Test setup successfully!
-        test_basic: command took 20ms (success), expected [0ms, 1000ms]
-        test_some_load: command took 21ms (success), expected [0ms, 4000ms]
-        test_heavy_load: command took 234ms (success), expected [0ms, 8000ms]
-        test_match_rules: command took 2333ms (success), expected [0ms, 8000ms]
-
-install:
-  git-repos:
-    - url: https://gitlab.apertis.org/tests/dbus-dos-reply-time.git
-      branch: 'apertis/v2023dev1'
-
-run:
-  steps:
-    - "# Enter test directory:"
-    - cd dbus-dos-reply-time
-    - "# Execute the following command:"
-    - common/run-test-in-systemd --name=dbus-dos-reply-time --user=user --timeout=900 ./run-test.sh
-