Finalise marks database migration

[sjd210]

Database migration for the work to start using a "marks" field in #731.

For sites with LLM-marked questions enabled (local/staging/all of Ada), this migration involves either
a) reading the "marks" field from the question_attempt JSON for LLM-marked questions
b) using the correct column to determine marks, with 0 marks for an incorrect attempt and 1 mark for a correct attempt for all other questions

For sites without LLM-marked questions enabled (Isaac live), we stick with just the simpler (b) - which is convenient since this is the much larger database. The relevant functions will need to be uncommented for this.

Also to note: this "marks" field has been written to since mid-January, however this script runs up to the present and so will override the values currently in the column. Not much time has passed, and it should do so with the exact same values so I don't think this is a big deal.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.94%. Comparing base (72414b9) to head (54dd980).
⚠️ Report is 68 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #763   +/-   ##
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  Coverage   39.94%   39.94%           
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  Files         546      546           
  Lines       23907    23907           
  Branches     2873     2873           
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  Hits         9550     9550           
  Misses      13450    13450           
  Partials      907      907           

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[sjd210]

@jsharkey13 If the migration has now been done on all sites, shall we merge this?