[ZEPPELIN-6019] Remove Submarine support #4763
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What is this PR for?
Apache Submarine is sunset, and they are discussing moving it to attic
https://lists.apache.org/thread/lzh28tn4psfbtp8ooc4ftw3rc9m949cn
What type of PR is it?
Breaking change, it removes a functionality.
Todos
N/A
What is the Jira issue?
ZEPPELIN-6019
How should this be tested?
Pass CI
Screenshots (if appropriate)
Questions: