Compute Worker - Fix submission files duplication

[ihsaan-ullah]

Description

This PR has the following updates:

.env_sample

• updated for minor changes to WORKER_BUNDLE_URL_REWRITE

src/apps/competitions/tasks.py

• updated to send submission during both ingestion and scoring, and some other minor updates for clarity

computer_worker.py

• separate class SubmissionStatus for submission statuses and related updates
• separate class ProgramKind for program kind and related updates
• introduced a new class Settings that gathers all env variables. This class is now used all over the code for accessing settings. NOTE: This can be further improved to convert strings to booleans so that we don't use == "true" or `== "false".
• organized imports
• renamed program to scoring_program
• update code start function to clarify which functions will run during ingestion and during scoring, and separated submission and scoring program clearly
• made submission available ragardless of ingestion or scoring in app/ingested_program
• rewrote _run_program_directory function to simplify code and logs
• moved some code from _run_program_directory to a new function _create_container for reusability and clarity
• minor changes to watch_detailed_results function to avoid looping forever
• replaced container_id (undeclared) by container.get("Id") in _run_container_engine_cmd`
• [TO DISCUSS] commented some code (that was introduced in Worker status to FAILED instead of SCORING or FINISHED in case of failure #2030 ) at the end of the start function that was failing submission even if everything went well. Need to discuss this and update the code

Issues this PR resolves

• Compute worker - Avoid duplicating submission files #1874

A checklist for hand testing

• Upload this modified mini autoML bundle to check in ingestion logs and scoring logs that submission files are accessible Modified_Bundle.zip
• use this submission to test the bundle submittion.zip
• Carefully check the code to make sure there are no bugs

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge

[Didayolo]

• Put the duplication on scoring (ingested program --> results) to avoid breaking current competition design
• In the future we can optimize this more