[Chore] Change preview app name for sentinel mode

name can be too long for some feature branches, makes sure it's as short as possible

.gitlab-ci.yml

@@ -106,7 +106,7 @@ ui smoketests with sentinel redis:
     - !reference [.e2e-codeceptjs-preview, before_script]
     - unset SUITE_SERVICE_URL
     - export E2E_ADMIN_PW=$ADMIN_PW
-    - export LAUNCH_URL=https://$PREVIEW_APP_NAME-sentinel.dev.oxui.de/appsuite/
+    - export LAUNCH_URL=https://$PREVIEW_APP_NAME-sntnl.dev.oxui.de/appsuite/
     - echo "LAUNCH_URL=$LAUNCH_URL"
   script:
     - yarn e2e-rerun @smoketest

.gitlab/preview-sentinel/values-template.yaml

@@ -6,7 +6,7 @@ core-ui-middleware:
   image:
     repository: ${CI_REGISTRY_IMAGE}
     tag: ${TAG_NAME}
-host: ${PREVIEW_APP_NAME}-sentinel.dev.oxui.de
+host: ${PREVIEW_APP_NAME}-sntnl.dev.oxui.de
 
 appsuite:
   core-ui: