Deprecate CppUTest Test Adapter

[scottabauer]

• [x ] I have read the note above about PRs contributing or fixing extensions
• I have tried reaching out to the extension maintainers about publishing this extension to Open VSX (if not, please create an issue in the extension's repo using this template).
• [ x] This extension has an OSI-approved OSS license (we don't accept proprietary extensions in this repository)

Description

Deprecating CppUTest Test Adapter

[filiptronicek]

Hey there @scottabauer 👋, thanks for your contribution.
Could you please do the following:

• Revert deletion of the line at EoF
• Sign our contribution agreement, so that we can merge your code