Remove deprecated headers

[aamijar]

There are currently 20 files that have the following message

#ifndef RAFT_HIDE_DEPRECATION_WARNINGS
#pragma message(__FILE__                                                  \
                " is deprecated and will be removed in a future release." \
                " Please use the raft/sparse/solver version instead.")
#endif

Additionally, there are 25 files that have the following message

/**
 * This file is deprecated and will be removed in a future release.
 */

These files were planned to be removed a long time ago in favor of other headers, so we should remove them.