Change quickstarts to have a dependency on "flink-dist"

I suggest we change the quickstarts to have the following dependencies.

• flink-dist (provided)
• log4j (runtime)

That way the projects created from quickstarts have exactly the same dependencies as what the distribution provides. That solves all our mismatches between needing different dependencies for compiling/running-in-IDE and packaging for deployment.

For example, we can add the flink-connector-base and flink-connector-files back to flink-dist without having any issues with setting up dependencies in the user projects.