Run/check getting-started scripts

[NickLarsenNZ]

For each operator with a getting_started.sh script, run the following:

# Some of the scripts are in a code/ subdirectory
# pushd docs/modules/superset/examples/getting_started
# pushd docs/modules/superset/examples/getting_started/code
pushd $(fd -td getting_started | grep examples); cd code 2>/dev/null || true

# Make a fresh cluster (~12 seconds)
kind delete cluster && kind create cluster
./getting_started.sh stackablectl

# Make a fresh cluster (~12 seconds)
kind delete cluster && kind create cluster
./getting_started.sh helm

popd

Add the following checklist to the PRs:

```[tasklist]
### Run getting_started.sh via
- [ ] `stackablectl`
- [ ] `helm`
```

### Tasks
- [ ] https://github.com/stackabletech/airflow-operator/pull/466
- [ ] https://github.com/stackabletech/druid-operator/pull/589
- [ ] https://github.com/stackabletech/hbase-operator/pull/528
- [ ] https://github.com/stackabletech/hdfs-operator/pull/553
- [ ] https://github.com/stackabletech/hive-operator/pull/489
- [ ] https://github.com/stackabletech/kafka-operator/pull/732
- [ ] https://github.com/stackabletech/nifi-operator/pull/646
- [ ] https://github.com/stackabletech/opa-operator/pull/601
- [ ] https://github.com/stackabletech/spark-k8s-operator/pull/432
- [ ] https://github.com/stackabletech/superset-operator/pull/515
- [ ] https://github.com/stackabletech/trino-operator/pull/616
- [ ] https://github.com/stackabletech/zookeeper-operator/pull/838

Important

kafka-operator requires kafkacat (kcat in nix)

Note

The list above was generated by:

# cd to directory where you store the stackabletech repos locally
find -name 'getting_started.sh' -not -path './operator-templating/*' \
| cut -d/ -f2 \
| sort \
| sed 's/^/- [ ] /'

If you want to reuse a cluster, you can delete everything by doing:

# Delete Stackable Custom Resources
kubectl get crds | grep stackable | cut -d' ' -f1 | xargs -I {} kubectl -n default delete {} --all

# Delete well-known Kubernetes Resources in the default namespace
kubectl -n default delete all --all --grace-period 0

# Delete the operators
stackablectl release uninstall dev

# delete the Stackable Custom Resource Definitions
kubectl get crds | grep stackable | cut -d' ' -f1 | xargs -I {} kubectl delete crd {}

# You might need to check on any Helm releases
helm list
helm uninstall ...

[NickLarsenNZ]

Earlier in the process I was fixing as many lint issues as I could (even for files that weren't touched). But from now (kafka-operator), I will only fix what is required to speed up the process.