chore: drop copies only an install provides

A file that arrives with the emulator is already on the user's machine
and the packs leave it out. 4558 collected copies (1.4 GB) were reached
only by such entries, with no platform, other profile entry or install
manifest needing them. They are removed, and two release-asset copies
leave the ignore list. bundled_only.py now lists every copy of a listed
file, since the database keeps one path per content, and pipeline step
4d fails while one remains.

.gitignore

@@ -27,7 +27,6 @@ bios/Sony/PlayStation Vita/PSP2UPDAT.PUP
 /data/
 
 # Large files stored as GitHub Release assets (additional)
-bios/Other/mame4droid-2024/data/history.db
 bios/Other/mame4droid-2024/data/.variants/history.db.615619e8
 bios/Interplay/Descent/d1x-rebirth/d1xr-opl3-music.dxa
 bios/Interplay/Descent/d1x-rebirth/d1xr-sc55-music.dxa
@@ -87,7 +86,6 @@ bios/Nintendo/Wii/nand.bin
 bios/Other/fbneo/fbneo/samples/donpachi.zip
 bios/Other/fbneo/fbneo/samples/sfz3mix.zip
 bios/Other/fbneo/fbneo/samples/twotiger.zip
-bios/Other/starboard/starboard-rootfs.tar.gz
 bios/Other/cspect/cspect-next-8gb.zip
 
 # Wenquxing NC3000 NAND image (66MB, fetched from large-files release)