Remove support for legacy semantics for field/method search

[marcphilipp]

Overview

Remove support for legacy semantics for field/method search

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I hereby agree to the terms of the JUnit Contributor License Agreement.

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes

[sbrannen]

I was hoping to get to remove that myself, but... oh well. 😇

Looks good! And I'm happy to see it gone.

I only requested a small change to the wording in the release notes.