Delete unused Docker class

[elharo]

Description

Delete unused test class

Motivation and Context

We haven't used this code in 5 years. We're not going to use it now.

Impact

none

Test Plan

mvn test-compile

Contributor checklist

• [x] Please make sure your submission complies with our development, formatting, commit message, and attribution guidelines.
• [x] PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• [ ] Documented new properties (with its default value), SQL syntax, functions, or other functionality.
• [ ] If release notes are required, they follow the release notes guidelines.
• [ ] Adequate tests were added if applicable.
• [x] CI passed.

Release Notes

== NO RELEASE NOTE ==