docs: move remote.copy.local documentation to Mount-Remote-Storage page
Moved the remote.copy.local command documentation and comparison table
from Cache-Remote-Storage.md to Mount-Remote-Storage.md for better
organization, as it's more related to mounting and syncing operations.
docs: add remote.copy.local documentation and command comparison table
Added comprehensive documentation for the new remote.copy.local command
including usage examples, filters, and options. Also added a comparison
table showing the differences between remote.cache, remote.uncache, and
remote.copy.local commands, along with a typical workflow example.