.buildkite/benchmarks.pipeline: Increase parallelization

This matches the parallelization and timeout of the
code.pipeline.yml that also runs all default scenarios.

Author: martintomazic

.buildkite/benchmarks.pipeline.yml

@@ -117,8 +117,8 @@ steps:
   # E2E test jobs with enabled benchmarking
   #########################################
   - label: E2E tests
-    parallelism: 7
-    timeout_in_minutes: 30
+    parallelism: 30
+    timeout_in_minutes: 20
     command:
       - .buildkite/scripts/download_e2e_test_artifacts.sh
       - rm -rf /var/tmp/benchmarks/*