BULL-3233: unit tests job

Also renamed a directory we mount to pipeline job containers from "/root" to "/local-dev" since /root is a special directory in the Linux file system. Update:

• Added some comments on where scripts were copied from and where minor changes were made.
• Updated some scripts based on recent (yesterday!) changes to the original scripts in source.

docker/pipeline-jobs/docker-compose-trufflehog.yml

@@ -8,7 +8,9 @@ services:
     environment:
       - REPORTS_DIR=/local-dev/${BASE_REPORTS_DIR}/trufflehog<<subProject>>
       - SCRIPTS_DIR=/local-dev/${BASE_SCRIPTS_DIR}/trufflehog
+      - UTILITY_DIR=/local-dev/${BASE_SCRIPTS_DIR}/utility
       - SCAN_DIR=/app
+      - CI_JOB_NAME=trufflehog<<subProject>>
       - TRUFFLEHOG_EXCLUDE_PATHS=<<exclusions>>
     volumes:
       - ./:/local-dev