Updated configurations and removed Cucumber Reports

[darnjo]

The following things have been addressed with this PR:

• Removed all Cucumber Reporting steps and code, updated README to reflect the removal.
• Moved all output files to build/certification within the project directory and put them under results, reports, and cucumberJson (for downstream Cucumber Reporting plugins, such as that in Jenkins).
• Addded GradleDocker config file so containers may be built that specifically run Docker tasks.
• Added GitHub Workflow to add a GradleDocker image to the GitHub Docker registry on commit to main.
• Reorganized and updated README.
• removed additional --strict flags in Cucumber JVM (since they're deprecated).
• Fixed issue with synonym checker not running in when -Dstrict=true is passed.
• Separated payloads and IDX backing glue code.