stop adding additional payments to an order

[Richard-Pentecost]

Delete any payments that already belong to the order being seeded in the database. The e2e tests, test for there being 2 payments for an order that is put in the database and has been paid. Previously when running the api locally, if you stopped and then restarted without deleting the database, it would add another 2 payments for this order each time you restarted causing locally run e2e tests to fail. Fix put in to delete any payments from the database for this order when creating the order

Description of change

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[code-review-doctor]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@af3a13d). Click here to learn what that means.
Report is 5 commits behind head on main.

Files	Patch %	Lines
...mis/order/management/commands/set_order_as_paid.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5405   +/-   ##
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  Coverage        ?   96.39%           
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  Files           ?      938           
  Lines           ?    22328           
  Branches        ?     2002           
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  Hits            ?    21524           
  Misses          ?      656           
  Partials        ?      148           

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