fix(config): remove duplicate config_env_test.go causing redeclaration compile errors

Agent-Logs-Url: https://github.com/github/gh-aw-mcpg/sessions/84f15ad5-3ffd-4df9-8ed6-f14cba32c6a5

Co-authored-by: lpcox <15877973+lpcox@users.noreply.github.com>

Author: Copilot