refactor(shim-opentracing): Use tree-shakeable string constants for semconv

[JohannesHuster]

Which problem is this PR solving?

Updates #4567

Short description of the changes

Replace deprecated imports from @opentelemetry/semantic-conventions with new (tree-shakeable) string constants for package @opentelemetry/shim-opentracing. What I did:

• Search for “@opentelemetry/semantic-conventions” in package path.
  • Add new imports and check that new and old strings match exactly.
  • Use new imports and remove old ones.

Type of change

• Bug fix (non-breaking change which fixes an issue) (refactor)

How Has This Been Tested?

• npm test

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
  • No new functionality
• Documentation has been updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.09%. Comparing base (ecc88a3) to head (6dad43f).
Report is 4 commits behind head on main.

❗ Current head 6dad43f differs from pull request most recent head f002387

Please upload reports for the commit f002387 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4746      +/-   ##
==========================================
+ Coverage   91.04%   92.09%   +1.05%     
==========================================
  Files          89      150      +61     
  Lines        1954     3099    +1145     
  Branches      416      663     +247     
==========================================
+ Hits         1779     2854    +1075     
- Misses        175      245      +70     

see 62 files with indirect coverage changes