chore(support): add assignees for issue templates

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -2,6 +2,8 @@ name: Bug report 🐛
 description:
   Something isn't working as expected? Here is the right place to report.
 title: '[YOUR TITLE]: Brief description'
+assignees:
+  - jeffchew,ljcarot,oliviaflory,annawen1
 labels: ['bug']
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -2,6 +2,8 @@ name: Feature Request 💡
 description:
   Suggest a new idea for the project.
 title: '[YOUR TITLE]: Brief description'
+assignees:
+  - jeffchew,ljcarot,oliviaflory,annawen1
 labels: ['Feature request']
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/question.yaml

@@ -2,6 +2,8 @@ name: Question 🤔
 description:
   Usage question or discussion about Carbon for IBM.com.
 title: '[YOUR TITLE]: Brief description'
+assignees:
+  - jeffchew,ljcarot,oliviaflory,annawen1
 labels: ['question']
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/user_story.yaml

@@ -1,4 +1,4 @@
-name: User story
+name: (Carbon team only) User story
 description:
   Write a user story to begin solving their needs.
 title: '[YOUR TITLE]: Brief description'