Use bigger runner for linux (#3925)

## Changes
Use new 8 core runners for ubuntu tests.

On this PR
- direct tests took 1m38s. Previous times from most recent closed PRs:
2m 36s, 2m 30s, 2m 29s.
- terraform tests took 6m10s. Previous times: 10m 51s, 10m 59s, 10m 47s.

Author: denik

.github/workflows/push.yml

@@ -40,7 +40,8 @@ jobs:
       matrix:
         os:
           - macos-latest
-          - ubuntu-latest
+          - group: databricks-protected-runner-group-large
+            labels: linux-ubuntu-latest-large
           - windows-latest
         deployment:
           - "terraform"