Fix infinite load more

[AlexVelezLl]

Summary

• Fix infinite load more in lessons/quizzes resource selection
  • In the fetch tree resources, we were incorrectly setting the results of the last topic data if we were loading more resources from the tree fetch

Compartir.pantalla.-.2025-03-11.13_16_48.mp4

References

Closes #13173.

Reviewer guidance

1. Go to coach > lessons > manage resources
2. Load any folder whose resource list is paginated.
3. Check that there are no regressions neither browsing the resources in the resources tree nor inside folders that appear in search results

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.18.0a3.dev0_git.33.gccb68d61.pex
Windows Installer (EXE)	kolibri-0.18.0a3.dev0+git.33.gccb68d61-windows-setup-unsigned.exe
Debian Package	kolibri_0.18.0a3.dev0+git.33.gccb68d61-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.18.0a3.dev0+git.33.gccb68d61.dmg
Android Package (APK)	kolibri-0.18.0a3.dev0+git.33.gccb68d61-0.1.4-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.18.0a3.dev0+git.33.gccb68d61.zip
TAR file	kolibri-0.18.0a3.dev0+git.33.gccb68d61.tar.gz
WHL file	kolibri-0.18.0a3.dev0+git.33.gccb68d61-py2.py3-none-any.whl

[pcenov]

Hi @AlexVelezLl, I confirm that the issue described in #13173 is fixed now and I didn't observe any regressions.

[rtibbles]

Code changes make sense, and manual QA checks out.