chore: remove redundant MTC volumes from pathways template

MTC volumes are dynamically generated by storage.go and injected into VolumeMountsYAML and VolumesYAML for both pathways and non-pathways jobs. The sidecar initContainer still uses hardcoded mounts as it intentionally bypasses the global VolumeMountsYAML block.

Author: Neelabh94

cmd/job/submit_test.go

@@ -278,6 +278,8 @@ func setupSubmitTestEnv(t *testing.T) {
 	topology = ""
 	gkeScheduler = ""
 	platform = "linux/amd64"
+	mtcEnabled = false
+	mtcRamdiskDirectory = ""
 	awaitJobCompletion = false
 	priority = "medium"
 	isPathwaysJob = false