chore: disable stack traces in systests (#6086)

## Motivation

This PR disables the stack traces in sys tests. If necessary they could be turned back on again.
<!-- Give a brief description of the motivation for this PR. 1-2 sentences is fine. -->

systest/testcontext/context.go

@@ -341,7 +341,8 @@ func New(t *testing.T, opts ...Opt) *Context {
 		ns = "test-" + rngName()
 	}
 	clSize := clusterSize.Get(p)
-	logger := zaptest.NewLogger(t, zaptest.WrapOptions(zap.IncreaseLevel(logLevel), zap.AddCaller()))
+	logger := zaptest.NewLogger(t, zaptest.WrapOptions(zap.IncreaseLevel(logLevel), zap.AddCaller(),
+		zap.AddStacktrace(zap.FatalLevel)))
 	cctx := &Context{
 		Context:           ctx,
 		Parameters:        p,