Update pull request template to suggest creating a discussion (#16669)

* Update pull request template to suggest creating a discussion for large changes

* Update template

* Ignore github changes

.github/pull_request_template.md

@@ -1,5 +1,11 @@
 ## Proposed change
 <!--
+  Thank you!
+
+  If you're introducing a new feature or significantly refactoring existing functionality, 
+  we encourage you to start a discussion first. This helps ensure your idea aligns with 
+  Frigate's development goals.
+
   Describe what this pull request does and how it will benefit users of Frigate.
   Please describe in detail any considerations, breaking changes, etc. that are 
   made in this pull request.

.github/workflows/pull_request.yml

@@ -4,6 +4,7 @@ on:
   pull_request:
     paths-ignore:
       - "docs/**"
+      - ".github/**"
 
 env:
   DEFAULT_PYTHON: 3.11