Revert "pr-crio-cgrpv2-imagefsfs-e2e-kubetest2: decrease parallelism"

This reverts commit 6ce6634f113b64ddef3565f7d0c53644c8faec60.

Author: bart0sh

config/jobs/kubernetes/sig-node/sig-node-presubmit.yaml

@@ -1335,7 +1335,7 @@ presubmits:
         - --
         - --repo-root=.
         - --gcp-zone=us-west1-b
-        - --parallelism=2
+        - --parallelism=8
         - --timeout=3h
         - --focus-regex=\[NodeConformance\]|\[NodeFeature:.+\]|\[NodeFeature\]
         - --skip-regex=\[Flaky\]|\[Slow\]|\[Serial\]