OpenTracing Shim: Do not map semconv values from OT to OTel.

[carlosalberto]

Fixes #5004

Also removed related redundant assertions (i.e. SpanKind checks) for a few test cases in the testbed.

[codecov]

Codecov Report

Base: 91.27% // Head: 91.28% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (773bc11) compared to base (f490ba8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5016      +/-   ##
============================================
+ Coverage     91.27%   91.28%   +0.01%     
+ Complexity     4885     4880       -5     
============================================
  Files           552      552              
  Lines         14433    14418      -15     
  Branches       1373     1369       -4     
============================================
- Hits          13173    13161      -12     
+ Misses          874      873       -1     
+ Partials        386      384       -2     

Impacted Files	Coverage Δ
...opentelemetry/opentracingshim/SpanBuilderShim.java	94.78% <100.00%> (+0.98%)	⬆️
...ava/io/opentelemetry/opentracingshim/SpanShim.java	91.07% <100.00%> (+0.80%)	⬆️

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