chore(workflow): run jobs on public runners (#9643)

# Which Problems Are Solved

Build and test workflows are currently running on specific GitHub hosted
runners. These is not needed for most worklfows and just costs more.

# How the Problems Are Solved

Moved all the steps apart from integration-tests to public runners.

# Additional Changes

None

# Additional Context

None

.github/workflows/e2e.yml

@@ -10,8 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         browser: [firefox, chrome]
-    runs-on:
-      group: zitadel-public
+    runs-on: ubuntu-latest
     steps:
       - 
         name: Checkout Repository