Let check-for-reproducer run only on newly created issues. (#38634)

Summary:
Pull Request resolved: #38634

To reduce the noise of the `check-for-reproducer` bot, this restricts the event
that trigger the bot to only the issue creation.

Changelog:
[Internal] [Changed] - Let check-for-reproducer run only on newly created issues

Reviewed By: cipolleschi

Differential Revision: D47792374

fbshipit-source-id: 738a9342899e234022029e94f43b0dccebc21819

.github/workflows/check-for-reproducer.yml

@@ -3,9 +3,7 @@ name: Check for reproducer
 # Also, when a comment is added, edited or deleted.
 on:
   issues:
-    types: [opened, edited]
-  issue_comment:
-    types: [created, edited, deleted]
+    types: [opened]
 
 jobs:
   check-for-reproducer: