Manually instrument traces in pixl_cli, orthanc_raw, and orthanc_anon

[p-j-smith]

Description

Fixes #639 Instrument the cli, Orthanc Raw, and Orthanc Anon so we can follow a DICOM study end-to-end

• add a new function pixl_core.tracing.configure_tracing to set up a tracing provider
• instrument the CLI. We first need to set relevant environment variables, which is done using _configure_telemetry_env_vars. Then configure tracing and instrument pika
• manually start a span before each message to the queue
• instrument Orthanc Raw. This is currently only instrumented for record_dicom_headers, not for the actual C-MOVE
• instrument Orthanc Anon
• add tests to check logs and traces are correlated
• move the fixtures created for testing logging into the conftest so they can be reused for testing tracing

Type of change

Please delete options accordingly to the description.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Suggested Checklist

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have commented my code, particularly in hard-to-understand areas.
• I have passed on my local host device. (see further details at the CONTRIBUTING document)
• Make sure your branch is up-to-date with main branch. See CONTRIBUTING for a general example to syncronise your branch with the main branch.
• I have requested review to this PR.
• I have addressed and marked as resolved all the review comments in my PR.
• Finally, I have selected squash and merge

All logs selected for a given trace_id (the trace corresponds to processing one of the DICOM studies in the integration tests):

logs.mov

All spans for the same trace_id

trace.mov

[codecov]

Codecov Report

❌ Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.53%. Comparing base (fe104ac) to head (1109433).

Files with missing lines	Patch %	Lines
cli/src/pixl_cli/main.py	91.66%	1 Missing ⚠️
pixl_core/src/core/patient_queue/producer.py	92.85%	1 Missing ⚠️
pixl_core/src/core/tracing.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
+ Coverage   85.85%   88.53%   +2.68%     
==========================================
  Files          75       80       +5     
  Lines        3500     3813     +313     
==========================================
+ Hits         3005     3376     +371     
+ Misses        495      437      -58     

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