[Exporter.Zipkin] Use new attributes to propagate scope

[Kielek]

Changes

Use new attributes to propagate scope according to https://github.com/open-telemetry/opentelemetry-specification/blob/v1.31.0/specification/common/mapping-to-non-otlp.md#instrumentationscope

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• [ ] Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 85.42%. Comparing base (6250307) to head (fbd29b2).
Report is 142 commits behind head on main.

❗ Current head fbd29b2 differs from pull request most recent head f9523f5. Consider uploading reports for the commit f9523f5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5473      +/-   ##
==========================================
+ Coverage   83.38%   85.42%   +2.04%     
==========================================
  Files         297      289       -8     
  Lines       12531    12511      -20     
==========================================
+ Hits        10449    10688     +239     
+ Misses       2082     1823     -259     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	85.42% <50.00%> (?)
unittests-Solution-Stable	85.39% <50.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...plementation/ZipkinActivityConversionExtensions.cs	95.79% <50.00%> (-0.79%)	⬇️

... and 61 files with indirect coverage changes

[CodeBlanch]

LGTM