chore: link CONTRIBUTING.md in issue and feature request templates (#32514)

(cherry picked from commit f1984aa0905626ee05b5fd9fdef3cf35b77d951e)

.github/DISCUSSION_TEMPLATE/feature-request.yaml

@@ -9,6 +9,8 @@ body:
         Stick to only a single feature per request. If you list multiple different features at once, 
         your request will be closed.
 
+        Please read our [contributing guidelines](https://github.com/immich-app/immich/blob/main/CONTRIBUTING.md) before opening a feature request.
+
   - type: checkboxes
     attributes:
       label: I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request.

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -1,6 +1,11 @@
 name: Report an issue with Immich
 description: Report an issue with Immich
 body:
+  - type: markdown
+    attributes:
+      value: |
+        Please read our [contributing guidelines](https://github.com/immich-app/immich/blob/main/CONTRIBUTING.md) before opening an issue.
+
   - type: checkboxes
     attributes:
       label: I have searched the existing issues, both open and closed, to make sure this is not a duplicate report.