chore: add spark 3.5.6

[razvan]

Description

Part of: #1141

Definition of Done Checklist

Note

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

• Changes are OpenShift compatible
• All added packages (via microdnf or otherwise) have a comment on why they are added
• Things not downloaded from Red Hat repositories should be mirrored in the Stackable repository and downloaded from there
• All packages should have (if available) signatures/hashes verified
• Add an entry to the CHANGELOG.md file
• Integration tests ran successfully

TIP: Running integration tests with a new product image

The image can be built and uploaded to the kind cluster with the following commands:

bake --product <product> --image-version <stackable-image-version>
kind load docker-image <image-tagged-with-the-major-version> --name=<name-of-your-test-cluster>

See the output of bake to retrieve the image tag for <image-tagged-with-the-major-version>.

[NickLarsenNZ]

I think this is deprecated, not removed in this release

[NickLarsenNZ]

As discussed, the client it being removed as it is only used in demos.

If it is being used in tests, it will need to stay in for the release.

[razvan]

Spark connect support is experimental has not been released yet. The tests are performed with the version of our choosing which has been 3.5.5 until now but we update it to 3.5.6.
There is no requirement to keep the connect client for 3.5.5 around, unless we discover major bugs with 3.5.6.