fix: Correctly encode user given content, such as passwords

[sbernauer]

Description

Fixes https://github.com/stackabletech/nifi-operator/issues/624 Needs https://github.com/stackabletech/docker-images/pull/706

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
- [x] Code contains useful comments
- [ ] Code contains useful logging statements
- [x] (Integration-)Test cases added
- [ ] Documentation added or updated. Follows the [style guide](https://docs.stackable.tech/home/nightly/contributor/docs-style-guide).
- [x] Changelog updated
- [x] 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

[sbernauer]

As the product images have been build now started https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/nifi-operator-it-custom/57/console

[sbernauer]

Tests passed first try :rocket: