refactor(instrumentation-router): update semconv usage to ATTR_ exports

[trentm]

Refs: #2377

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.64%. Comparing base (f04c640) to head (b700b54).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2851      +/-   ##
==========================================
- Coverage   89.69%   89.64%   -0.05%     
==========================================
  Files         184      184              
  Lines        9032     9032              
  Branches     1852     1852              
==========================================
- Hits         8101     8097       -4     
- Misses        931      935       +4     

Files with missing lines	Coverage Δ
...etry-instrumentation-router/src/instrumentation.ts	95.89% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[github-actions]

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