The remote objects cmake api was released as public API in 6.1, so we can't just rename the functions.
Keep the old names for compatibility (qt6_add_repc_source, qt6_add_repc_replica), but add a warning to the implementation of those functions to use the new names instead (effectively the old names are deprecated).
qt6_add_repc_files should have been internal, but unfortunately it's already public API, so add a warning not to use it, and the warning should instead say to use of the
`qt6_add_repc_sources`, `qt6_add_repc_replicas`, `qt6_add_repc_merged` functions instead (this can be done by checking the type 'argument' passed into the function)
The function is now effectively deprecated.
Ensure to remove all the old names from docs.