[config/confighttp] Fix high cardinality span name from request method from confighttp server internal telemetry

[carsonip]

Description

Bound cardinality from request method in span name by passing thorugh upper case request method only if well known, otherwise set {method} to HTTP.

Implemented according to https://opentelemetry.io/docs/specs/semconv/http/http-spans/

Link to tracking issue

Fixes #14516

Testing

Unit test for unknown method and lowercase method.

Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.84%. Comparing base (cce7dc1) to head (281bdf8).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14522      +/-   ##
==========================================
- Coverage   91.85%   91.84%   -0.01%     
==========================================
  Files         677      677              
  Lines       42705    42712       +7     
==========================================
+ Hits        39226    39230       +4     
- Misses       2425     2427       +2     
- Partials     1054     1055       +1     

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing elastic:confighttp-span-name-method (281bdf8) with main (cce7dc1)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 61 untouched benchmarks
⏩ 20 skipped benchmarks¹

Footnotes

1. 20 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[axw]

LGTM, thanks!