chore(github): Assign types to issues from forms

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

.github/ISSUE_TEMPLATE/bug_report_form.yml

@@ -1,5 +1,6 @@
 name: "Bug"
 description: "Have you encountered a bug? Submit a report and help us improve Nextcloud Mail"
+type: "Bug"
 labels: ["bug", "0. to triage"]
 body:
 - type: textarea

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,5 +1,6 @@
 name: "Feature request"
 description: "You have a neat idea that should be implemented?"
+type: "Enhancement"
 labels: ["enhancement", "0. to triage"]
 body:
   - type: textarea