Attempt to fix LibEGL Version mismatch

Lib EGL mismatches with installed mesa packages. According to an online bug report[1],
this might be because we are conflicting with the installed packages that gnome was built with.

This cleans up packages to try and avoid conflicts with the gnome extension.

[1]: https://forum.snapcraft.io/t/issues-with-gnome-extension-on-core22-mesa-version-mismatch/39260

snapcraft.yaml

@@ -19,7 +19,6 @@ apps:
   packetsender:
     command: usr/local/bin/packetsender
     desktop: usr/share/applications/packetsender.desktop
-
     plugs:
       - desktop
       - desktop-legacy
@@ -62,4 +61,22 @@ parts:
       - qt6-qpa-plugins
       - qt6-wayland
       - cups-client
+  # This part removes all the files in this snap which already exist in
+  # connected content and base snaps. Since these files will be available
+  # at runtime from the content and base snaps, they do not need to be
+  # included in this snap itself.
+  #
+  # More info: https://forum.snapcraft.io/t/reducing-the-size-of-desktop-snaps/17280#heading--cleanup-part
+  #
+  cleanup:
+    after:  # Make this part run last; list all your other parts here
+      - packetsender
+    plugin: nil
+    build-snaps:  # List all content-snaps and base snaps you're using here
+      - core22
+    override-prime: |
+      set -eux
+      for snap in "core22" "gnome" ; do  # List all content-snaps and base snaps you're using here
+          cd "/snap/$snap/current" && find . -type f,l -exec rm -f "$SNAPCRAFT_PRIME/{}" \;
+      done