ci: run docker-scenarios on ubuntu-8-core-latest (#140)

Move the docker-scenarios job to GitHub Larger Runners
(ubuntu-8-core-latest, dedicated VM per job) to reduce
scheduling/neighbour noise that inflates profiler assertion
error margins.

Motivation: stabilize some wall clock checks for Python.

Author: r1viollet

.github/workflows/test.yml

@@ -17,7 +17,9 @@ on:
 
 jobs:
   docker-scenarios:
-    runs-on: ubuntu-latest
+    # Larger runner (dedicated VM per job) to reduce scheduling noise that
+    # skews profiler error margins.
+    runs-on: ubuntu-8-core-latest
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Set up Go