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

[sbernauer]

Description

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Definition of Done Checklist

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1. Changes are OpenShift compatible
2. CRD changes approved
3. CRD documentation for all fields, following the style guide.
4. Helm chart can be installed and deployed operator works
5. Integration tests passed (for non trivial changes)
6. Changes need to be "offline" compatible

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1. Code contains useful comments
2. Code contains useful logging statements
3. (Integration-)Test cases added
4. Documentation added or updated. Follows the style guide.
5. Changelog updated
6. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
2. Proper release label has been added
3. Roadmap 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/