Remove requests, use httpx for sync and async HTTP requests

[Marc-Andrieu]

Description

Summary

Split #845 into a 3rd PR with only the removal of requests and its major consequence: send logs asynchronously.

Changes Made

• replace all requests use with httpx, or remove it
  • consequence: the asynchronicity of sending logs propagates, and is escaped using FastAPI's BackgroundTasks

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 🔨 Refactor (non-breaking change that neither fixes a bug nor adds a feature)
• 🔧 Infra CI/CD (changes to configs of workflows)
• 💥 BREAKING CHANGE (fix or feature that require a new minimal version of the front-end)

Impact & Scope

• Core functionality changes
• Single module changes
• Multiple modules changes
• Database migrations required
• Other

Testing

• Added/modified tests that pass the CI
• Tested in a pre-prod
• Tested this locally

Documentation

• Updated docs accordingly (docs.myecl.fr) :
• Code includes docstrings
• No documentation needed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.43%. Comparing base (0067564) to head (d5be9cf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #876   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         206      206           
  Lines       14918    14918           
=======================================
  Hits        12596    12596           
  Misses       2322     2322           

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