Align ISSUE_TEMPLATE with the new label system (#27573)

As title

.github/ISSUE_TEMPLATE/bug-report.yaml

@@ -1,6 +1,6 @@
 name: Bug Report
 description: Found something you weren't expecting? Report it here!
-labels: ["kind/bug"]
+labels: ["type/bug"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/feature-request.yaml

@@ -1,6 +1,6 @@
 name: Feature Request
 description: Got an idea for a feature that Gitea doesn't have currently?  Submit your idea here!
-labels: ["kind/proposal"]
+labels: ["type/proposal"]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/ui.bug-report.yaml

@@ -1,6 +1,6 @@
 name: Web Interface Bug Report
 description: Something doesn't look quite as it should?  Report it here!
-labels: ["kind/bug", "kind/ui"]
+labels: ["type/bug", "topic/ui"]
 body:
   - type: markdown
     attributes: