chore: correct add-on name in issue templates

Author: javier-godoy

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,5 +1,5 @@
 name: Bug Report
-description: Please report issues related to TEMPLATE_ADDON here.
+description: Please report issues related to JsonMigrationHelper Add-On here.
 body:
   - type: textarea
     id: problem-description

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -1,5 +1,5 @@
 name: Feature Request
-description: Please add feature suggestions related to TEMPLATE_ADDON here.
+description: Please add feature suggestions related to JsonMigrationHelper Add-On here.
 body:
   - type: textarea
     id: feature-proposal