fix(logs): using usagers row instead of previewTable for total count

[hbalty]

No description provided.

[revu-bot]

This PR correctly fixes logging inconsistencies in the import preview functionality. The changes align the preview mode logging with the success mode logging by using usagersRows.length (valid usagers) instead of importPreviewRows.length (all rows) for the total count, and properly updates the action name to reflect it's a preview operation. The changes are focused and semantically correct.

[hbalty]

Dans le previewTable qu'on envoie au client, si l'info est mauvaise c'est ce qui va être envoyé au client et affiché dans le front :
{{ previewTable.totalCount }} domiciliés seront importés sur DomiFa

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 64.82%. Comparing base (4304077) to head (c173b5c).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/usagers/controllers/import/import.controller.ts	66.66%	1 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff            @@
##           master    #3913    +/-   ##
========================================
  Coverage   64.82%   64.82%            
========================================
  Files         980      980            
  Lines       16661    16666     +5     
  Branches     2327     2329     +2     
========================================
+ Hits        10800    10804     +4     
+ Misses       5672     5503   -169     
- Partials      189      359   +170     

Files with missing lines	Coverage Δ
...mport/step3-create/usagersImportCreator.service.ts	100.00% <100.00%> (ø)
...rc/usagers/controllers/import/import.controller.ts	86.86% <66.66%> (-1.02%)	⬇️

... and 75 files with indirect coverage changes

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[tokenbureau]

🎉 This PR is included in version 2.220.18 🎉

The release is available on GitHub release

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