chore: fix dev-utils/ci-tav-slow-jobs.sh (elastic#3319)

- The util accidentally had debugging code that locked it to
  an old dev/test branch instead of "main"
- Improve the util to skip over incomplete tav runs

Author: trentm

dev-utils/ci-tav-slow-jobs.sh

@@ -20,12 +20,11 @@ set -o errexit
 set -o pipefail
 
 branch=main
-branch=test/action-tav
-latestTavRun=$(gh run list -R elastic/apm-agent-nodejs -b "$branch" -w TAV -L 1 --json databaseId --jq '.[].databaseId')
-gh api --paginate repos/elastic/apm-agent-nodejs/actions/runs/$latestTavRun/jobs \
+latestCompletedTavRun=$(gh run list -R elastic/apm-agent-nodejs -b "$branch" -w TAV -L5 --json status,databaseId | json -c 'this.status==="completed"' | json 0.databaseId)
+gh api --paginate repos/elastic/apm-agent-nodejs/actions/runs/$latestCompletedTavRun/jobs \
     | json -ga jobs \
     | json -ga -e '
-        this.s = (new Date(this.completed_at) - new Date(this.started_at)) / 1000;
-        this.minSec = Math.floor(this.s/60) + "m" + (this.s%60).toString().padStart(2,"0") + "s"
+        this.s = (new Date(this.completed_at || Date.now()) - new Date(this.started_at)) / 1000;
+        this.minSec = Math.floor(this.s/60) + "m" + (this.s%60).toString().padStart(2,"0").slice(0,2) + "s"
         ' s minSec name \
     | sort -n