core: remove Python uv cache clean command

Removed the cache clean command for Python uv.
UV uses aggresive cache method, so it can be only cleared with --force, thats in my opinion to unsafe:

Example: 
root@paperless-ngx:~# uv cache prune
Cache is currently in-use, waiting for other uv processes to finish (use `--force` to override)

Example with force:
root@paperless-ngx:~# uv cache clean --force
Clearing cache at: .cache/uv
Removed 118567 files (1.4GiB)

Author: MickLesk

misc/core.func

@@ -392,8 +392,6 @@ cleanup_lxc() {
 
   # Python pip
   if command -v pip &>/dev/null; then $STD pip cache purge || true; fi
-  # Python uv
-  if command -v uv &>/dev/null; then $STD uv cache clean || true; fi
   # Node.js npm
   if command -v npm &>/dev/null; then $STD npm cache clean --force || true; fi
   # Node.js yarn