update requests to scheduler

[KentonParton]

Description

When adding distributed tracing such as open telemetry, it requires the ability to modify headers. This PR allows that for requests between swiple-api and swiple-scheduler

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [ ] I have performed a self-review of my own code
• [ ] All GitHub workflows have passed
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

[codecov-commenter]

Codecov Report

Patch coverage: 41.66% and project coverage change: -0.10 :warning:

Comparison is base (5da9a9a) 67.31% compared to head (aa2b71a) 67.21%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   67.31%   67.21%   -0.10%     
==========================================
  Files          71       71              
  Lines        3121     3133      +12     
==========================================
+ Hits         2101     2106       +5     
- Misses       1020     1027       +7     

Impacted Files	Coverage Δ
backend/app/api/api_v1/endpoints/schedule.py	44.61% <12.50%> (-4.51%)	:arrow_down:
backend/app/api/api_v1/endpoints/dataset.py	98.26% <100.00%> (+0.03%)	:arrow_up:
backend/app/api/api_v1/endpoints/datasource.py	80.68% <100.00%> (+0.44%)	:arrow_up:

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