fix(ci3): sanitize slash in TARGET_BRANCH for test history URL

Author: AztecBot

ci3/exec_test

@@ -36,7 +36,7 @@ Env: REF_NAME=${REF_NAME:-} CURRENT_VERSION=${CURRENT_VERSION:-} CI_FULL=${CI_FU
 Date: $(date)
 System: ARCH=$(arch) CPUS=$(nproc --all) MEM=$(free -h | awk '/^Mem:/{print $2}') HOSTNAME=$(hostname)
 Resources: CPU_LIST=$CPU_LIST CPUS=$CPUS MEM=$MEM TIMEOUT=$TIMEOUT
-History: $DASHBOARD_URL/list/history_$test_hash${TARGET_BRANCH:+_$TARGET_BRANCH}
+History: $DASHBOARD_URL/list/history_$test_hash${TARGET_BRANCH:+_${TARGET_BRANCH//\//_}}
 
 EOF
 

ci3/run_test_cmd

@@ -236,8 +236,10 @@ function track_test {
   redis_cli LTRIM $list_key 0 $max_lines &>/dev/null
 }
 
+# Slashes in TARGET_BRANCH (e.g. merge-train/spartan) are replaced with underscores
+# so the key is safe to embed in the /list/<key> dashboard URL.
 function track_test_history {
-  track_test "history_${test_hash}${TARGET_BRANCH:+_$TARGET_BRANCH}" "$1" ${2:-}
+  track_test "history_${test_hash}${TARGET_BRANCH:+_${TARGET_BRANCH//\//_}}" "$1" ${2:-}
 }
 
 function track_test_failed {