fix: export obsolete products only once and include "obsolete" field in CSV export

[deveshidwivedi]

What

• This PR implements a fix to ensure that obsolete products are exported only once and do not appear as duplicates .
• Introduces a new field "obsolete" in the CSV export.

Related issue(s) and discussion

• Fixes Obsolete products appear as duplicates in CSV export #9684

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.59%. Comparing base (dc04d18) to head (aa13461).
Report is 220 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10077      +/-   ##
==========================================
+ Coverage   49.54%   49.59%   +0.05%     
==========================================
  Files          67       70       +3     
  Lines       20650    20967     +317     
  Branches     4980     5025      +45     
==========================================
+ Hits        10231    10399     +168     
- Misses       9131     9276     +145     
- Partials     1288     1292       +4     

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