feat: issue consolidation (#2112)

Author: jtracey93

.github/ISSUE_TEMPLATE/BUG_REPORT.md

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: ALZ bugs / features / questions (everything goes here)
+    url: https://github.com/Azure/Azure-Landing-Zones/issues/new/choose
+    about: Centralized repo for all Azure landing zone (ALZ) bugs, features, and questions (new for 2026)