e2e: have e2e use ci.Parallel

This is a followup to having tests run in serial in CI.

The e2e package isn't in CI, but lets use the helper anyway
so we can setup semgrep rules covering the entire repository.

e2e/framework/framework.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/hashicorp/nomad/ci"
 	"github.com/stretchr/testify/require"
 )
 
@@ -212,7 +213,7 @@ func (f *Framework) runCase(t *testing.T, s *TestSuite, c TestCase) {
 	t.Run(c.Name(), func(t *testing.T) {
 		// If the TestSuite has Parallel set, all cases run in parallel
 		if s.Parallel {
-			t.Parallel()
+			ci.Parallel(t)
 		}
 
 		f := newF(t)