Remove remnants of internal OTLP types

[yurishkuro]

Description of the changes

• Remove unused internal OTLP types, as a follow-up on Use official OTLP types in api_v3 and avoid triple-marshaling #5098
• Marking it "breaking" to show up next to Use official OTLP types in api_v3 and avoid triple-marshaling #5098 in the changelog, since technically these are exposed APIs from Jaeger-as-a-library

How was this change tested?

• CI

[github-actions]

Test Results

2 060 tests   - 25   2 050 ✅  - 25   1m 9s ⏱️ -1s
  216 suites  -  4      10 💤 ± 0 
    1 files   ± 0       0 ❌ ± 0 

Results for commit 5ac0127. ± Comparison against base commit c1e72fc.

This pull request removes 25 tests.

github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshal
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshal/Valid_span_id
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshal/Valid_trace_id
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalSpan
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalSpan/invalid_IDs/JSON
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalSpan/invalid_IDs/Protobuf
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalSpan/valid_IDs/JSON
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalSpan/valid_IDs/Protobuf
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalTo
github.com/jaegertracing/jaeger/model/v2 ‑ TestMarshalTo/Invalid_span_id_buffer
…

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (126c49b) 94.46% compared to head (5ac0127) 95.56%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5107      +/-   ##
==========================================
+ Coverage   94.46%   95.56%   +1.10%     
==========================================
  Files         320      317       -3     
  Lines       18394    18284     -110     
==========================================
+ Hits        17375    17473      +98     
+ Misses        876      651     -225     
- Partials      143      160      +17     

Flag	Coverage Δ
cassandra-3.x	25.58% <ø> (?)
cassandra-4.x	25.58% <ø> (?)
elasticsearch-5.x	19.87% <ø> (?)
elasticsearch-6.x	19.87% <ø> (ø)
elasticsearch-7.x	19.99% <ø> (-0.02%)	⬇️
elasticsearch-8.x	20.09% <ø> (ø)
grpc-badger	19.51% <ø> (+<0.01%)	⬆️
kafka	14.09% <ø> (?)
opensearch-1.x	20.00% <ø> (?)
opensearch-2.x	19.99% <ø> (?)
unittests	93.22% <ø> (-0.06%)	⬇️

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