ci: Depot runners for unit tests (WIP)

[khvn26]

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• [x] I have run pre-commit to check linting
• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

This makes the unit tests run on the 16-core Depot runner. Running time decrease is expected.

How did you test this code?

This is a CI change.

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[github-actions[bot]]

Uffizzi Ephemeral Environment deployment-46979

:cloud: https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/3447

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (46bda97) 95.91% compared to head (843509f) 95.91%.

:exclamation: Current head 843509f differs from pull request most recent head ce4c62b. Consider uploading reports for the commit ce4c62b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3447   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files        1092     1092           
  Lines       34010    34010           
=======================================
  Hits        32622    32622           
  Misses       1388     1388           

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