improve(performances): run RSS item image fetching only on filtered pages list

[Guts]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.40260% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.41%. Comparing base (67858c5) to head (168d919).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
mkdocs_rss_plugin/util.py	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
- Coverage   81.70%   80.41%   -1.30%     
==========================================
  Files          11       11              
  Lines         749      776      +27     
  Branches      124      130       +6     
==========================================
+ Hits          612      624      +12     
- Misses         95      110      +15     
  Partials       42       42              

Flag	Coverage Δ
unittests	80.41% <97.40%> (-1.30%)	⬇️

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Files with missing lines	Coverage Δ
...lugin/integrations/theme_material_social_plugin.py	70.96% <100.00%> (-7.26%)	⬇️
mkdocs_rss_plugin/models.py	100.00% <100.00%> (ø)
mkdocs_rss_plugin/plugin.py	91.27% <100.00%> (+0.62%)	⬆️
mkdocs_rss_plugin/util.py	72.72% <85.71%> (-2.00%)	⬇️

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud