Add button to DAGS to override values of today's logs

[alexglasertpx]

Overview
Following on from digital-land/technical-documentation#211 add a button to DAGS if DM wish to override the latest values in log.csv. There may be an instance where a new endpoint is added after the overnight runs so this option will add the result to log.csv

Tech Approach

1. Add button to DAGS
2. if button set to True. then download all of the json files associated with today's endpoints and replace the rows for today in log.csv and today's json files
3. Output error if button is set to False and there are new endpoints (need to refine since we don't want the overnight runs to error so have check that says if nothing in log for today then run collection and update log as normal).
4. Once happy then reset regenerate-log-override button to False.
5. If an endpoint isn't fetched that was previously for that day, generate an error.
6. If no collection has been run today, then we process as normal.

Workflow expected to be like this

Acceptance Criteria/Tests
Ensure that the log files are updated (even if the outputs are the same)
Add a new json file(s) / edit a current json file and see what happens to the log.csv file
Set button to False & add new json file(s), see if we get an error

[alexglasertpx]

Checklist for this ticket:

• Create Mural for workflow
• Incorporate force-refetch parameter into fetch code to ensure that latest json files are downloaded
• Incorporate overwrite-today parameters into load_csv code to ensure that log file doesn't download latest values
• Add force-refetch parameter to makerules (make collect)
• Add 'overwrite-today` parameter (make collection) same as above but different context,
• Add on new button to Airflow
• Check in Dev that collections are working correctly (run once when 'fetch_todays_logs' are set to false and once when set to True).
• Check what logs look like when REGENERATE_LOG_OVERRIDE is set to True or False and if there are differences
• Check results when running on dev, will likely need to compare results from dev and results locally

[alexglasertpx]

Moving to 'Blocked' as there are a few issues with dev that we are waiting to resolve and will need help from other members of the team to ensure that environmental variables are being passed from Airflow, etc into the Collect class.

[alexglasertpx]

Looks like the dev issues have resolved themselves. Have 'split' the parameter from REGENERATE_TODAYS_LOGS into two components, force_refetch and overwrite_today. They are the same value but they do different things, so easier for the user to read. The former refetches the json files that are needed to create today's logs, whereas the latter is used to ensure we don't load in the values of the logs relating to today (and potentially duplicate endpoints in the logs).

[CarlosCoelhoSL]

Waiting on the collection issues to be fixed before merging the following PRs:
#332
digital-land/makerules#73
digital-land/airflow-dags#27