task: use local mit-tr instead of MIT self-hosted

[YohannParis]

Description

• Needs to be merged after orchestration PR that change MIT_TR_URL from mit-hosted to mit-tr.
• Remove OPEN_AI_KEY as it is embedded as an ENV in orchestration for mit-tr

To be honest I don't know if we want to make that OPEN_AI_KEY optional in case someone (MIT) is not running their mit-tr container with an already set key?

[codecov]

Codecov Report

Merging #16 (3377ee6) into main (2c32c25) will decrease coverage by 0.15%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   81.78%   81.63%   -0.15%     
==========================================
  Files           5        5              
  Lines         505      501       -4     
==========================================
- Hits          413      409       -4     
  Misses         92       92              

Files Changed	Coverage Δ
api/server.py	90.76% <ø> (ø)
api/utils.py	74.60% <ø> (ø)
workers/operations.py	74.67% <100.00%> (-0.43%)	⬇️

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[YohannParis]

This is still needed as mit-tr is poorly written and we cannot really leverage ENV variables.