* Imrpove documentation and testing for PodMonitors
* Fix missed references and a typo
### Motivation
Before upgrading to 3.0.0, we want to make sure the kube-prometheus-stack is well documented.
### Modifications
* Update tests and examples to fully disable `PodMonitors` and the installation of the kube-prometheus-stack CRDs.
### Verifying this change
The current tests will cover these changes.
Related to #311
### Motivation
In #299, I updated the values without also updating the test values. As a result, I unintentionally enabled the monitoring stack in the tests and broke some examples. Because we are deploying all resources to a single node. It is possible that we are resource constrained, so I am going to re-disable the monitoring stack.
### Modifications
* Update test cluster configurations to re-disable deploying the monitoring stack
* Update examples with the new configuration
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
### Motivation
In #269, we added a way to configure external zookeeper servers. However, it was added to the wrong section of the zookeeper config. The `zookeeper.configData` section is mapped directly into the zookeeper configmap.
### Modifications
Move `zookeeper.configData.ZOOKEEPER_SERVERS` to `zookeeper.externalZookeeperServerList`
### Verifying this change
This is a cosmetic change on an unreleased feature.
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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.
