[Bug] Not able to set default backlog-quota retention policy , default retention policy and default TTL

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Version

pulsar helm chart version - 3.3.0
k8s version - v1.28.5+k3s1

### Minimal reproduce step

When installing pulsar using pulsar helm chart added these values to broker.configData
```
backlogQuotaDefaultRetentionPolicy: "consumer_backlog_eviction"
backlogQuotaDefaultLimitBytes: "322122547200"
backlogQuotaDefaultLimitSecond: "1209600"
defaultRetentionTimeInMinutes: "2880"
defaultRetentionSizeInMB: "-1"
ttlDurationDefaultInSeconds: "259200"
topicLevelPoliciesEnabled: "true"

```
exec in pulsar broker pod
do `bin/pulsar-admin namespaces get-backlog-quotas public/functions`

### What did you expect to see?

the output should be ->
`destination_storage BacklogQuotaImpl(limit=322122547200, limitSize=322122547200, limitTime=1209600, policy=consumer_backlog_eviction)`

### What did you see instead?

I get no output

same goes for retention policy and ttl -> i get null as output , but it should return the default ttl and default return policy values as output respectively

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with the Pulsar Helm chart's broker.configData values and reproduce on Helm chart 3.3.0 with the listed Kubernetes version. Run pulsar-admin namespaces get-backlog-quotas public/functions and check the corresponding retention and TTL outputs; done means the configured default backlog quota, retention policy, and TTL are returned instead of empty or null results.

Written by the indexing model from the issue text.