Field is immutable error when upgrading helm chart after changing zk replica count

**Describe the bug**
Recently we increased zookeeper replicas from 1 to 3 when moving a cluster to prod. When we did this, we discovered the init jobs (https://github.com/apache/pulsar-helm-chart/blob/master/charts%2Fpulsar%2Ftemplates%2Fbookkeeper-cluster-initialize.yaml and https://github.com/apache/pulsar-helm-chart/blob/master/charts%2Fpulsar%2Ftemplates%2Fpulsar-cluster-initialize.yaml) cannot be upgraded if you change the zookeeper replica count.

Chart upgrade fails with a `field is immutable` error. This appears to be because the `args` field in a job is immutable, but it's being changed because it's referenced in the init jobs:

* https://github.com/apache/pulsar-helm-chart/blob/master/charts%2Fpulsar%2Ftemplates%2Fbookkeeper-cluster-initialize.yaml#L52
* https://github.com/apache/pulsar-helm-chart/blob/master/charts%2Fpulsar%2Ftemplates%2Fpulsar-cluster-initialize.yaml#L62

**Workarounds attempted**
* We deleted the init jobs to let them be recreated.
* However this led to disaster as they're not idempotent and re-initialized everything, and we had to rebuild the cluster.
* Setting `initialize: false` in helm values
* We cannot do this since our use-case is installing Pulsar as part of on-prem installation

**To Reproduce**
1. Install the chart
2. Change `values.zookeeper.replicaCount` (eg. from 3 to 5)
3. Upgrade the chart
4. You will get a "field is immutable" error:

```
Error: UPGRADE FAILED: cannot patch "pulsar-bookie-init" with kind Job: Job.batch "pulsar-bookie-init" is invalid: spec.template: Invalid value: core.PodTemplateSpec{ObjectMeta:v1.ObjectMeta{Name:"", GenerateName:"", Namespace:"", SelfLink:"", UID:"", ResourceVersion:"", Generation:0, CreationTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}}, DeletionTimestamp:(*v1.Time)(nil), DeletionGracePeriodSeconds:(*int64)(nil), Labels:map[string]string{"controller-uid":"070ad83b-8c2b-4e77-bc15-fdb7f6c9915f", "job-name":"pulsar-bookie-init", "kots.io/app-slug":"REDACTED", "kots.io/backup":"velero"}, Annotations:map[string]string{"kots.io/app-slug":"REDACTED"}, OwnerReferences:[]v1.OwnerReference(nil), Finalizers:[]string(nil), ClusterName:"", ManagedFields:[]v1.ManagedFieldsEntry(nil)}, Spec:core.PodSpec{Volumes:[]core.Volume(nil), InitContainers:[]core.Container{core.Container{Name:"wait-zookeeper-ready", Image:"streamnative/pulsar-all:2.7.2.8", Command:[]string{"sh", "-c"}, Args:[]string{"until nslookup pulsar-zookeeper-2.pulsar-zookeeper.default; do\n sleep 3;\ndone;"}, WorkingDir:"", Ports:[]core.ContainerPort(nil), EnvFrom:[]core.EnvFromSource(nil), Env:[]core.EnvVar(nil), Resources:core.ResourceRequirements{Limits:core.ResourceList(nil), Requests:core.ResourceList(nil)}, VolumeMounts:[]core.VolumeMount(nil), VolumeDevices:[]core.VolumeDevice(nil), LivenessProbe:(*core.Probe)(nil), ReadinessProbe:(*core.Probe)(nil), StartupProbe:(*core.Probe)(nil), Lifecycle:(*core.Lifecycle)(nil), TerminationMessagePath:"/dev/termination-log", TerminationMessagePolicy:"File", ImagePullPolicy:"IfNotPresent", SecurityContext:(*core.SecurityContext)(nil), Stdin:false, StdinOnce:false, TTY:false}}, Containers:[]core.Container{core.Container{Name:"pulsar-bookie-init", Image:"streamnative/pulsar-all:2.7.2.8", Command:[]string{"sh", "-c"}, Args:[]string{"bin/apply-config-from-env.py conf/bookkeeper.conf;\nif bin/bookkeeper shell whatisinstanceid; then\n echo \"bookkeeper cluster already initialized\";\nelse\n bin/bookkeeper shell initnewcluster;\nfi\n"}, WorkingDir:"", Ports:[]core.ContainerPort(nil), EnvFrom:[]core.EnvFromSource{core.EnvFromSource{Prefix:"", ConfigMapRef:(*core.ConfigMapEnvSource)(0xc00dfdf3c8), SecretRef:(*core.SecretEnvSource)(nil)}}, Env:[]core.EnvVar(nil), Resources:core.ResourceRequirements{Limits:core.ResourceList(nil), Requests:core.ResourceList(nil)}, VolumeMounts:[]core.VolumeMount(nil), VolumeDevices:[]core.VolumeDevice(nil), LivenessProbe:(*core.Probe)(nil), ReadinessProbe:(*core.Probe)(nil), StartupProbe:(*core.Probe)(nil), Lifecycle:(*core.Lifecycle)(nil), TerminationMessagePath:"/dev/termination-log", TerminationMessagePolicy:"File", ImagePullPolicy:"IfNotPresent", SecurityContext:(*core.SecurityContext)(nil), Stdin:false, StdinOnce:false, TTY:false}}, EphemeralContainers:[]core.EphemeralContainer(nil), RestartPolicy:"Never", TerminationGracePeriodSeconds:(*int64)(0xc007772f88), ActiveDeadlineSeconds:(*int64)(nil), DNSPolicy:"ClusterFirst", NodeSelector:map[string]string(nil), ServiceAccountName:"", AutomountServiceAccountToken:(*bool)(nil), NodeName:"", SecurityContext:(*core.PodSecurityContext)(0xc007372480), ImagePullSecrets:[]core.LocalObjectReference(nil), Hostname:"", Subdomain:"", SetHostnameAsFQDN:(*bool)(nil), Affinity:(*core.Affinity)(nil), SchedulerName:"default-scheduler", Tolerations:[]core.Toleration(nil), HostAliases:[]core.HostAlias(nil), PriorityClassName:"", Priority:(*int32)(nil), PreemptionPolicy:(*core.PreemptionPolicy)(nil), DNSConfig:(*core.PodDNSConfig)(nil), ReadinessGates:[]core.PodReadinessGate(nil), RuntimeClassName:(*string)(nil), Overhead:core.ResourceList(nil), EnableServiceLinks:(*bool)(nil), TopologySpreadConstraints:[]core.TopologySpreadConstraint(nil)}}: field is immutable && cannot patch "pulsar-pulsar-init" with kind Job: Job.batch "pulsar-pulsar-init" is invalid: spec.template: Invalid value: core.PodTemplateSpec{ObjectMeta:v1.ObjectMeta{Name:"", GenerateName:"", Namespace:"", SelfLink:"", UID:"", ResourceVersion:"", Generation:0, CreationTimestamp:v1.Time{Time:time.Time{wall:0x0, ext:0, loc:(*time.Location)(nil)}}, DeletionTimestamp:(*v1.Time)(nil), DeletionGracePeriodSeconds:(*int64)(nil), Labels:map[string]string{"controller-uid":"33def730-048f-4169-acdf-cac1ffed1637", "job-name":"pulsar-pulsar-init", "kots.io/app-slug":"REDACTED", "kots.io/backup":"velero"}, Annotations:map[string]string{"kots.io/app-slug":"REDACTED"}, OwnerReferences:[]v1.OwnerReference(nil), Finalizers:[]string(nil), ClusterName:"", ManagedFields:[]v1.ManagedFieldsEntry(nil)}, Spec:core.PodSpec{Volumes:[]core.Volume(nil), InitContainers:[]core.Container{core.Container{Name:"wait-zookeeper-ready", Image:"streamnative/pulsar-all:2.7.1.3", Command:[]string{"sh", "-c"}, Args:[]string{"until nslookup pulsar-zookeeper-2.pulsar-zookeeper.default; do\n sleep 3;\ndone;"}, WorkingDir:"", Ports:[]core.ContainerPort(nil), EnvFrom:[]core.EnvFromSource(nil), Env:[]core.EnvVar(nil), Resources:core.ResourceRequirements{Limits:core.ResourceList(nil), Requests:core.ResourceList(nil)}, VolumeMounts:[]core.VolumeMount(nil), VolumeDevices:[]core.VolumeDevice(nil), LivenessProbe:(*core.Probe)(nil), ReadinessProbe:(*core.Probe)(nil), StartupProbe:(*core.Probe)(nil), Lifecycle:(*core.Lifecycle)(nil), TerminationMessagePath:"/dev/termination-log", TerminationMessagePolicy:"File", ImagePullPolicy:"IfNotPresent", SecurityContext:(*core.SecurityContext)(nil), Stdin:false, StdinOnce:false, TTY:false}, core.Container{Name:"pulsar-bookkeeper-verify-clusterid", Image:"streamnative/pulsar-all:2.7.1.3", Command:[]string{"sh", "-c"}, Args:[]string{"bin/apply-config-from-env.py conf/bookkeeper.conf;\nuntil bin/bookkeeper shell whatisinstanceid; do\n sleep 3;\ndone;\n"}, WorkingDir:"", Ports:[]core.ContainerPort(nil), EnvFrom:[]core.EnvFromSource{core.EnvFromSource{Prefix:"", ConfigMapRef:(*core.ConfigMapEnvSource)(0xc0102fc888), SecretRef:(*core.SecretEnvSource)(nil)}}, Env:[]core.EnvVar(nil), Resources:core.ResourceRequirements{Limits:core.ResourceList(nil), Requests:core.ResourceList(nil)}, VolumeMounts:[]core.VolumeMount(nil), VolumeDevices:[]core.VolumeDevice(nil), LivenessProbe:(*core.Probe)(nil), ReadinessProbe:(*core.Probe)(nil), StartupProbe:(*core.Probe)(nil), Lifecycle:(*core.Lifecycle)(nil), TerminationMessagePath:"/dev/termination-log", TerminationMessagePolicy:"File", ImagePullPolicy:"IfNotPresent", SecurityContext:(*core.SecurityContext)(nil), Stdin:false, StdinOnce:false, TTY:false}}, Containers:[]core.Container{core.Container{Name:"pulsar-pulsar-init", Image:"streamnative/pulsar-all:2.7.1.3", Command:[]string{"sh", "-c"}, Args:[]string{"\nbin/pulsar initialize-cluster-metadata \\\n --cluster pulsar \\\n --zookeeper pulsar-zookeeper:2181 \\\n --configuration-store pulsar-zookeeper:2181 \\\n --web-service-url http://pulsar-broker.default.svc.cluster.local:8080/ \\\n --web-service-url-tls https://pulsar-broker.default.svc.cluster.local:8443/ \\\n --broker-service-url pulsar://pulsar-broker.default.svc.cluster.local:6650/ \\\n --broker-service-url-tls pulsar+ssl://pulsar-broker.default.svc.cluster.local:6651/ || true;\n"}, WorkingDir:"", Ports:[]core.ContainerPort(nil), EnvFrom:[]core.EnvFromSource(nil), Env:[]core.EnvVar(nil), Resources:core.ResourceRequirements{Limits:core.ResourceList(nil), Requests:core.ResourceList(nil)}, VolumeMounts:[]core.VolumeMount(nil), VolumeDevices:[]core.VolumeDevice(nil), LivenessProbe:(*core.Probe)(nil), ReadinessProbe:(*core.Probe)(nil), StartupProbe:(*core.Probe)(nil), Lifecycle:(*core.Lifecycle)(nil), TerminationMessagePath:"/dev/termination-log", TerminationMessagePolicy:"File", ImagePullPolicy:"IfNotPresent", SecurityContext:(*core.SecurityContext)(nil), Stdin:false, StdinOnce:false, TTY:false}}, EphemeralContainers:[]core.EphemeralContainer(nil), RestartPolicy:"Never", TerminationGracePeriodSeconds:(*int64)(0xc00da13390), ActiveDeadlineSeconds:(*int64)(nil), DNSPolicy:"ClusterFirst", NodeSelector:map[string]string(nil), ServiceAccountName:"", AutomountServiceAccountToken:(*bool)(nil), NodeName:"", SecurityContext:(*core.PodSecurityContext)(0xc00618c800), ImagePullSecrets:[]core.LocalObjectReference(nil), Hostname:"", Subdomain:"", SetHostnameAsFQDN:(*bool)(nil), Affinity:(*core.Affinity)(nil), SchedulerName:"default-scheduler", Tolerations:[]core.Toleration(nil), HostAliases:[]core.HostAlias(nil), PriorityClassName:"", Priority:(*int32)(nil), PreemptionPolicy:(*core.PreemptionPolicy)(nil), DNSConfig:(*core.PodDNSConfig)(nil), ReadinessGates:[]core.PodReadinessGate(nil), RuntimeClassName:(*string)(nil), Overhead:core.ResourceList(nil), EnableServiceLinks:(*bool)(nil), TopologySpreadConstraints:[]core.TopologySpreadConstraint(nil)}}: field is immutable
```

**Expected behavior**
Expected the upgrade to succeed

**Screenshots**
n/a

**Desktop (please complete the following information):**
(happens on all versions)

**Additional context**
n/a