triagebot: add I-prioritize for regression issues

Author: jieyouxu

triagebot.toml

@@ -28,6 +28,20 @@ exclude_labels = [
 [autolabel."release-notes"]
 pr_merged = true
 
+# Prioritization of regression triaging.
+[autolabel."I-prioritize"]
+trigger_labels = [
+    "regression-from-stable-to-beta",
+    "regression-from-stable-to-nightly",
+    "regression-from-stable-to-stable",
+    "regression-untriaged",
+]
+exclude_labels = [
+    "P-*",
+    "requires-nightly",
+]
+
+
 [autolabel."A-CI"]
 trigger_files = [
     ".github/workflows",