chore: context stabilization tests & logging pieces

[scottgerring]

Fixes #2768
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 98.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.8%. Comparing base (b03296c) to head (412d14d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry/src/context.rs	98.3%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #2833     +/-   ##
=======================================
+ Coverage   80.7%   80.8%   +0.1%     
=======================================
  Files        124     124             
  Lines      23490   23743    +253     
=======================================
+ Hits       18961   19200    +239     
- Misses      4529    4543     +14     

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[bantonsson]

Looks good to me, only some comments about the test_out_of_order_context_detachment_futures.

[scottgerring]

Changes here cause the macros to print to stdout if you are running in a test. I find it super convenient to see internal logging when debugging tests. You need to opt into this with --nocapture when you run them, otherwise the output goes to /dev/null.

[cijothomas]

this is a good idea. Let us do this in a separate PR, as there are some tests which setup fmt layer already, and we need to discontinue that to avoid the duplication to stdout.

[cijothomas]

#2841 opened to check this.

[scottgerring]

@cijothomas great - thanks! I'll chase this up.