[fix] Fix duplicate reopen trigger

Removes 'reopened' from the types on `bot-autoassign-pr-issue-link.yml`.
The `bot-autoassign-pr-reopen.yml` already properly handles PR reopens,
meaning this additional trigger was causing bot spam and race conditions.

Author: Eeshu-Yadav

.github/workflows/bot-autoassign-pr-issue-link.yml

@@ -1,7 +1,7 @@
 name: PR Issue Auto-Assignment
 on:
   pull_request_target:
-    types: [opened, reopened, closed]
+    types: [opened, closed]
 permissions:
   contents: read
   issues: write