feat(CI): add LLM-generated to comment-aware labels (#39264)

Commenting `+LLM-generated` or `-LLM-generated` adds or removes the label.

Author: adomani

.github/workflows/labels_from_comment.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - name: Add / remove label based on comment
       run: |
-        labelArray=("awaiting-author" "awaiting-zulip" "WIP" "easy" "please-adopt" "help-wanted" "CI" "brownian" "carleson" "CFT" "FLT" "infinity-cosmos" "sphere-packing" "toric" "IMO" "t-algebra" "t-algebraic-geometry" "t-algebraic-topology" "t-analysis" "t-category-theory" "t-combinatorics" "t-computability" "t-condensed" "t-convex-geometry" "t-data" "t-differential-geometry" "t-dynamics" "t-euclidean-geometry" "t-geometric-group-theory" "t-group-theory" "t-linter" "t-logic" "t-measure-probability" "t-meta" "t-number-theory" "t-order" "t-ring-theory" "t-set-theory" "t-topology")
+        labelArray=("awaiting-author" "awaiting-zulip" "WIP" "easy" "please-adopt" "help-wanted" "CI" "brownian" "carleson" "CFT" "FLT" "infinity-cosmos" "sphere-packing" "toric" "LLM-generated" "IMO" "t-algebra" "t-algebraic-geometry" "t-algebraic-topology" "t-analysis" "t-category-theory" "t-combinatorics" "t-computability" "t-condensed" "t-convex-geometry" "t-data" "t-differential-geometry" "t-dynamics" "t-euclidean-geometry" "t-geometric-group-theory" "t-group-theory" "t-linter" "t-logic" "t-measure-probability" "t-meta" "t-number-theory" "t-order" "t-ring-theory" "t-set-theory" "t-topology")
 
         # we strip `\r` since line endings from GitHub contain this character
         COMMENT="${COMMENT//$'\r'/}"