Enable the pulsar manager in the minikube values (#270)

---

Fixes: https://github.com/apache/pulsar/issues/15927

### Motivation

We have documented the using pulsar manager in the Getting started
with helm in the pulsar website. We should enable the pulsar manager
by default in the minikube values.

### Modifications

- enable the pulsar manager by default in the minikube values.

examples/values-minikube.yaml

@@ -28,6 +28,7 @@ affinity:
 # disable auto recovery
 components:
   autorecovery: false
+  pulsar_manager: true
 
 zookeeper:
   replicaCount: 1
@@ -47,4 +48,4 @@ broker:
     managedLedgerDefaultAckQuorum: "1"
 
 proxy:
-  replicaCount: 1
+  replicaCount: 1