CI/Add dtq-dev-9-base to nightly UI-test trigger

Append dtq-dev-9-base to the branch list in trigger-ui-tests.yml so the
nightly job dispatches playwright-tests.yml for it alongside the customer/*
branches. The awk parser emits "dtq-dev-9-base/" for a non-namespaced branch,
so it cannot be picked up by the customer/ grep and is added explicitly.

Also includes a pre-existing working-tree edit adding customer/sav to
SKIP_BRANCHES.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: Matus Kasak

.github/workflows/trigger-ui-tests.yml

@@ -24,7 +24,8 @@ jobs:
 
           git fetch --prune origin
           BRANCHES=$(git ls-remote --heads origin | awk -F'/' '{print $3"/"$4}' | grep '^customer/')
-          SKIP_BRANCHES=("customer/uk" "customer/mendelu-v7" "customer/palo-docker" "customer/palo-docker-rebase" "customer/palo-docker-typo-fix")
+          BRANCHES="$BRANCHES"$'\n'"dtq-dev-9-base"
+          SKIP_BRANCHES=("customer/sav" "customer/uk" "customer/mendelu-v7" "customer/palo-docker" "customer/palo-docker-rebase" "customer/palo-docker-typo-fix")
           
           for branch in $(echo "$BRANCHES" | sed -e 's/[\[\]"]//g' -e 's/,/\n/g'); do
             if [[ " ${SKIP_BRANCHES[@]} " =~ " ${branch} " ]]; then