[cassandra][v2] Refactor FromDbModel and ToDbModel to accept and return dbmodel.Span

[Manik2708]

Which problem is this PR solving?

• Fixes a part of: Upgrade Storage Backends to V2 Storage API #6458

Description of the changes

• This PR refactors the converters to directly convert ptrace.Trace to database models of cassandra

How was this change tested?

• Unit Tests

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: npm run lint and npm run test

[codecov]

Codecov Report

❌ Patch coverage is 97.72727% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.67%. Comparing base (a6e3492) to head (c33e7ae).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...rnal/storage/v2/cassandra/tracestore/to_dbmodel.go	96.87%	2 Missing and 2 partials ⚠️
...al/storage/v2/cassandra/tracestore/from_dbmodel.go	98.68%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7809      +/-   ##
==========================================
+ Coverage   95.47%   95.67%   +0.19%     
==========================================
  Files         307      307              
  Lines       15892    15799      -93     
==========================================
- Hits        15173    15115      -58     
+ Misses        564      543      -21     
+ Partials      155      141      -14     

Flag	Coverage Δ
badger_v1	9.30% <0.00%> (+0.09%)	⬆️
badger_v2	1.95% <0.00%> (+0.01%)	⬆️
cassandra-4.x-v1-manual	13.75% <4.54%> (+0.13%)	⬆️
cassandra-4.x-v2-auto	1.94% <0.00%> (+0.01%)	⬆️
cassandra-4.x-v2-manual	1.94% <0.00%> (+0.01%)	⬆️
cassandra-5.x-v1-manual	13.75% <4.54%> (+0.13%)	⬆️
cassandra-5.x-v2-auto	1.94% <0.00%> (+0.01%)	⬆️
cassandra-5.x-v2-manual	1.94% <0.00%> (+0.01%)	⬆️
clickhouse	1.87% <0.00%> (+0.01%)	⬆️
elasticsearch-6.x-v1	17.76% <0.00%> (+0.17%)	⬆️
elasticsearch-7.x-v1	17.79% <0.00%> (+0.18%)	⬆️
elasticsearch-8.x-v1	17.95% <0.00%> (+0.18%)	⬆️
elasticsearch-8.x-v2	1.95% <0.00%> (+0.01%)	⬆️
elasticsearch-9.x-v2	1.95% <0.00%> (+0.01%)	⬆️
grpc_v1	8.95% <0.00%> (+0.09%)	⬆️
grpc_v2	1.95% <0.00%> (+0.01%)	⬆️
kafka-3.x-v2	1.95% <0.00%> (+0.01%)	⬆️
memory_v2	1.95% <0.00%> (+0.01%)	⬆️
opensearch-1.x-v1	17.84% <0.00%> (+0.18%)	⬆️
opensearch-2.x-v1	17.84% <0.00%> (+0.18%)	⬆️
opensearch-2.x-v2	1.95% <0.00%> (+0.01%)	⬆️
opensearch-3.x-v2	1.95% <0.00%> (+0.01%)	⬆️
query	1.95% <0.00%> (+0.01%)	⬆️
tailsampling-processor	0.56% <0.00%> (+<0.01%)	⬆️
unittests	94.29% <97.72%> (+0.18%)	⬆️

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[Manik2708]

working on code coverage

[yurishkuro]

please resolve merge conflicts