ci: migrate all workflows from incus-debian to debian:host runner

- Updated runs-on from incus-debian to debian:host across all workflow files
- Changed audit.yml, ci-cd.yml, ci.yml, fix.yml, security-scanning.yml, and test.yml
- Updated cli-level1-tests.yml from ubuntu-latest to debian:host
- Standardizes runner configuration across all CI/CD pipelines

.gitea/workflows/cli-level1-tests.yml

@@ -16,7 +16,7 @@ on:
 
 jobs:
   test-cli-level1:
-    runs-on: ubuntu-latest
+    runs-on: debian:host 
     
     strategy:
       matrix: