Add new music discs and models for various shops; remove obsolete files

- Introduced new music discs: "City Under Siege", "Clothing Shop", "Food Mart", "Hat Shop", "Interior Shop", "Pawn Shop", and "Jump Up" with corresponding models and textures.
- Updated sounds.json to include new music disc entries.
- Created new JSON files for music disc models and their textures.
- Removed outdated models and textures for cobblestone, emerald, and stick.
- Deleted unnecessary blockbench textures and environment textures.
- Updated pack metadata to reflect new pack format and supported versions.

data/new_music/jukebox_song/city_under_siege6.json

@@ -0,0 +1,8 @@
+{
+  "comparator_output": 1,
+  "description": "Author - City under siege",
+  "length_in_seconds": 362.100979,
+  "sound_event": {
+    "sound_id": "minecraft:music_disc.city_under_siege6"
+  }
+}