feat: Slack message to ci channel tagging owners on flakes.

ci3/run_test_cmd

@@ -94,7 +94,7 @@ function flake {
   read -r -d '' data <<EOF
   {
     "channel": "#aztec3-ci",
-    "text": "${slack_uids}: Test flaked \`$test_cmd\` http://ci.aztec-labs.com/$log_key"
+    "text": "${slack_uids% }: Test flaked \`$test_cmd\` http://ci.aztec-labs.com/$log_key"
   }
 EOF
   curl -X POST https://slack.com/api/chat.postMessage \