[zipkin] Replace OT constants with OTEL

[afzal442]

Which problem is this PR solving?

• Part of Upgrade internal use of tracing to OpenTelemetry #3381
• This PR adds otel trace spans const type to domain model

Short description of the changes

• Replace OT const with otel trace spans const i.e. ext.SpanKind.. with trace.SpanKind..

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (0d06c56) 97.06% compared to head (a753742) 97.05%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4625      +/-   ##
==========================================
- Coverage   97.06%   97.05%   -0.02%     
==========================================
  Files         301      301              
  Lines       17877    17878       +1     
==========================================
- Hits        17353    17351       -2     
- Misses        420      422       +2     
- Partials      104      105       +1     

Flag	Coverage Δ
unittests	97.05% <100.00%> (-0.02%)	⬇️

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Files Changed	Coverage Δ
model/converter/thrift/zipkin/to_domain.go	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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