chore: add a bot comment whenever the "request-discuss" label is adde…

…d to a GH issue (elastic#18390)

* chore: add a bot comment whenever the "request-discuss" label is added to a GH issue

The comment will be removed if the label is removed.

* fix: rename bot descriptor

.github/comment.yml

@@ -0,0 +1,8 @@
+---
+comments:
+  - label: needs_team
+    comment: |
+      This issue doesn't have a `Team:<team>` label.
+  - label: request-discuss
+    comment: |
+      Thank you very much for creating this issue. However, we would kindly like to ask you to post all questions and issues on the [Discuss forum](https://discuss.elastic.co/c/beats) first. In addition to awesome, knowledgeable community contributors, core Beats developers are on the forums every single day to help you out as well. So, your questions will reach a wider audience there, and if we confirm that there is a bug, then you can reopen this issue with the new information or open a new one.