(DOCSP-30167): Remove unused java files and includes from project (#95)

# Pull Request Info

[PR Reviewing
Guidelines](https://github.com/mongodb/docs-java/blob/master/REVIEWING.md)

Because the repo was copied from the Java repo (to maintain commit
histories), there are a lot of java code snippets and content not used
or relevant to the Kotlin driver. This PR removes all unused .java
files, code snippets, and .rst files from the kotlin repo.

JIRA - https://jira.mongodb.org/browse/DOCSP-30167
Staging -
https://docs-mongodborg-staging.corp.mongodb.com/kotlin/docsworker-xlarge/docsp-30167-remove-java/

## Self-Review Checklist

- [ ] Is this free of any warnings or errors in the RST?
- [ ] Did you run a spell-check?
- [ ] Did you run a grammar-check?
- [ ] Are all the links working?

Author: cbullinger