feat: Allow configuring NiFi proxy host behaviour

[labrenbe]

Description

Allow adding proxy hosts that should be allowed by NiFi or turning the host header check off entirely.

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

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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

Reviewer

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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)

Acceptance

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

[maltesander]

Could we add a test for this (e.g. set a proxy header in the smoke test and check if its set in the pod / configmap / settings- see https://github.com/stackabletech/trino-operator/blob/main/tests/templates/kuttl/resources/20-assert.yaml)?

[labrenbe]

Could we add a test for this (e.g. set a proxy header in the smoke test and check if its set in the pod / configmap / settings- see https://github.com/stackabletech/trino-operator/blob/main/tests/templates/kuttl/resources/20-assert.yaml)?

I've added an extra TestAssert step to the smoke test to not spam the test logs during 30-assert.

[maltesander]

LGTM overall. I would say (and with regard to the many support cases) to add a small documentation entry (explaining the whole * allow all behavior since this is patched by us and ready to be picked up by SEO)?
Edit: Changelog missing!

[maltesander]

Nice thanks, LGTM!