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/security-scanning.yml

@@ -5,7 +5,7 @@ on:
 
 jobs:
   audit:
-    runs-on: incus-debian
+    runs-on: debian:host 
     steps:
       - uses: actions/checkout@v4
       - run: npm install