fix: idempotent helm installations for demos/stacks and ignoring of existing jobs

[xeniape]

Description

Implementation for #312 and #333

Current procedure to upgrade a demo:

stackablectl demo install [demo] --release x.y
stackablectl release upgrade x.z
stackablectl demo install [demo] --release x.z

Example output of failed Job updates due to immutability:

$ target/debug/stackablectl demo install airflow-scheduled-job --release 25.3 Deploying Job/start-pyspark-job manifest failed due to immutability
Deploying Job/start-date-job manifest failed due to immutability
Installed demo "airflow-scheduled-job"
Use "stackablectl operator installed" to display the installed operators.
Use "stackablectl stacklet list" to display the installed stacklets.

---

Problem encountered during development when running helm upgrade --install on opensearch-dashboards

An unrecoverable error occured: failed to execute stack (sub)command
Caused by these errors (recent errors listed first):
1: failed to install stack "logging"
2: failed to install stack manifests
3: failed to install Helm release opensearch-dashboards
4: failed to upgrade/install Helm release
5: helm FFI library call failed (failed to replace object: Deployment.apps "opensearch-dashboards" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app.kubernetes.io/instance":"opensearch-dashboards", "app.kubernetes.io/name":"opensearch-dashboards"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable)

Thrown for opensearch-dashboards Helm Chart, because of opensearch-project/helm-charts#655
Should be working due to setting ChartSpec.Force = true in rust/helm-sys/go-helm-wrapper/main.go but does not.

Update/Solution: Due to changes in Helm 3 and how the --force flag works (helm/helm#7082 (comment)), @NickLarsenNZ and me decided to switch from the helm upgrade --install to the strategy of uninstalling the old Helm Chart and installing the new one instead for an upgrade.

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

# Author
- [ ] Changes are OpenShift compatible
- [ ] CRD changes approved
- [ ] Helm chart can be installed and deployed operator works
- [ ] Integration tests passed (for non trivial changes)

# Reviewer
- [ ] Code contains useful comments
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added

[NickLarsenNZ]

Just a couple of suggestions

[NickLarsenNZ]

LGTM.

Would you mind updating the PR description and adding example output for the Job immutable fields? I was just curious what to expect.