Remove yangtools-11.0.x jobs

11.0.x version of yangtools is no more being developed.
Remove its jobs.

Change-Id: I5a31b12ecb432a84119a9583d7db67cec143a97f
Signed-off-by: Yaroslav Lastivka <yaroslav.lastivka@pantheon.tech>

jjb/yangtools/yangtools.yaml

@@ -40,25 +40,6 @@
     # Used by the release job
     staging-profile-id: 1271cf710cc09d
 
-- project:
-    name: yangtools-11.0.x
-    jobs:
-      - odl-maven-jobs-jdk17
-      - odl-maven-verify-jobs-jdk17
-
-    project: yangtools
-    project-name: yangtools
-    branch: 11.0.x
-    stream: 11.0.x
-
-    mvn-settings: "yangtools-settings"
-
-    dependencies: ""
-    email-upstream: "[yangtools]"
-
-    # Used by the release job
-    staging-profile-id: 1271cf710cc09d
-
 - project:
     name: yangtools-release-management
     jobs: