fix: Use correct label selector for pod-driver-controller

[sbernauer]

Fixup of #515

Fixes

2025-01-25T14:55:33.797725Z ERROR stackable_operator::logging::controller: Failed to reconcile object controller.name="pod-driver.spark.stackable.tech" error=tried to reconcile object Pod.v1./pyspark-pi-20250125145500-5ae7fc949df5a93e-driver.kuttl-test-resolved-flounder that was not found in local store

Description

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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

[maltesander]

Thanks, LGTM!

[Techassi]

This bug was encountered by a user on Discord (who runs this operator in an production environment). It might be worth to mention this in the release notes for 25.3.

Okay, nevermind. This bug was never part of an released operator as far as I can see.

[sbernauer]

This bug was never part of an released operator as far as I can see.

Exactly, it only existed for 1-2 days in 0.0.0-dev