spark development setup docs includes instructions for `spark-interfaces-scala`

[fafnirZ]

spark dev setup docs still includes instructions for spark-interfaces-scala
https://openlineage.io/docs/development/developing/spark/setup/

whereas this module has been removed in this PR: OpenLineage/OpenLineage#2781

[fafnirZ]

so I didn't run that step and tried to run ./gradlew integrationTest within /integration/spark and ended up getting this error

so (correct me if I'm wrong) the codeblocks could just be replaced with this?

cd ../../integration/spark-extension-entrypoint && ./gradlew publishToMavenLocal