Replace bitnami Kafka image with soldevelo/kafka

[igor-soldev]

This change updates the Docker image used for Kafka in the Makefile from bitnami/kafka to soldevelo/kafka.
Soldevelo image is a drop-in replacement that remains fully compatible with Bitnami’s configuration and environment variables.

The Bitnami Kafka image is now behind a paywall and no longer publicly available, which prevents CI/CD and local environments from functioning properly.
Switching to Soldevelo’s maintained image ensures:

• continued compatibility with existing Kafka setup,
• availability of regular updates and security patches,
• use of an image from a trusted and open source provider.

[igor-soldev]

Hello team, just a friendly reminder about this PR.

I wanted to highlight that relying on the current solution (bitnamilegacy/kafka:4.0.0-debian-12-r10) carries significant risk. The most critical flaw of the bitnamilegacy repository is that it is frozen and immutable, meaning it will strictly never receive security updates (CVE patches) or bug fixes.

This PR switches to a maintained alternative (soldevelo/kafka) that ensures we stay secure and up-to-date.

I noticed there are merge conflicts now – I am happy to resolve them once I get a confirmation that we can proceed with this merge.