fix(helm): Add configuration options for the secret migration job

[siegfriedweber]

Description

• Helm chart: The secret migration job can be omitted via Helm values.
• Helm chart: The tag of the tools image used for the secret migration job can be changed in the Helm values and defaults to the current SDP version instead of 24.7.0.

part of #477

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

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1. Changes are OpenShift compatible
2. Helm chart can be installed and deployed operator works
3. Integration tests passed (for non trivial changes)
4. 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

[siegfriedweber]

✅ https://testing.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/secret-operator-it-custom/12/

[sbernauer]

Thanks!

[lfrancke]

I think it'd be useful to have a release note snippet for this.

[siegfriedweber]

Release Notes

Secret operator

Helm chart: The secret migration job required for upgrading from SDP 24.3 to 24.7, can now be omitted by setting the Helm value secretMigrationJob.enabled to false.