fix: Disable create-reporting-task for NiFi 2.x and document regression

[sbernauer]

Description

Please add a description here. This will become the commit message of the merge request later.

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
- [ ] CRD documentation for all fields, following the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] Helm chart can be installed and deployed operator works
- [ ] Integration tests passed (for non trivial changes)
- [ ] Changes need to be "offline" compatible

# Reviewer
- [ ] Code contains useful comments
- [ ] Code contains useful logging statements
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated. Follows the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs/style-guide).
- [ ] 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
- [ ] [Roadmap](https://github.com/orgs/stackabletech/projects/25/views/1) has been updated

[adwk67]

Currently testing this PR on openshift and test_nifi_metrics.py in e.g. the upgrade test doesn't detect any metrics.

[sbernauer]

LGTM when tests pass

[sbernauer]

Currently testing this PR on openshift and test_nifi_metrics.py in e.g. the upgrade test doesn't detect any metrics.

Good catch, the upgrade test probably also needs the same if clause

[sbernauer]

Only small doc nits, LGTM otherwise (I can't approve)

[maltesander]

LGTM!

[lfrancke]

Please include a link to the docs

[sbernauer]

Docs: https://docs.stackable.tech/home/nightly/nifi/usage_guide/monitoring/