Remove a deprecated multibyte_split API (rapidsai#16501)

Removes overloaded `cudf::io::text::multibyte_split` API deprecated in 24.08 and is no longer needed.

Authors:
  - David Wendt (https://github.com/davidwendt)

Approvers:
  - Nghia Truong (https://github.com/ttnghia)
  - Bradley Dice (https://github.com/bdice)

URL: rapidsai#16501

cpp/include/cudf/io/text/multibyte_split.hpp

@@ -96,26 +96,6 @@ std::unique_ptr<cudf::column> multibyte_split(
   rmm::cuda_stream_view stream      = cudf::get_default_stream(),
   rmm::device_async_resource_ref mr = rmm::mr::get_current_device_resource());
 
-/**
- * @brief Splits the source text into a strings column using a multiple byte delimiter.
- *
- * @deprecated Since 24.08
- *
- * @param source The source input data encoded in UTF-8
- * @param delimiter UTF-8 encoded string for which to find offsets in the source
- * @param byte_range The position and size within `source` to produce the column from
- * @param stream CUDA stream used for device memory operations and kernel launches
- * @param mr Memory resource to use for the device memory allocation
- * @return The strings found by splitting the source by the delimiter within the relevant byte
- * range.
- */
-[[deprecated]] std::unique_ptr<cudf::column> multibyte_split(
-  data_chunk_source const& source,
-  std::string const& delimiter,
-  std::optional<byte_range_info> byte_range,
-  rmm::cuda_stream_view stream      = cudf::get_default_stream(),
-  rmm::device_async_resource_ref mr = rmm::mr::get_current_device_resource());
-
 /** @} */  // end of group
 
 }  // namespace text

cpp/src/io/text/multibyte_split.cu

@@ -567,20 +567,6 @@ std::unique_ptr<cudf::column> multibyte_split(cudf::io::text::data_chunk_source
 
 }  // namespace detail
 
-// deprecated in 24.08
-std::unique_ptr<cudf::column> multibyte_split(cudf::io::text::data_chunk_source const& source,
-                                              std::string const& delimiter,
-                                              std::optional<byte_range_info> byte_range,
-                                              rmm::cuda_stream_view stream,
-                                              rmm::device_async_resource_ref mr)
-{
-  return multibyte_split(source,
-                         delimiter,
-                         parse_options{byte_range.value_or(create_byte_range_info_max())},
-                         stream,
-                         mr);
-}
-
 std::unique_ptr<cudf::column> multibyte_split(cudf::io::text::data_chunk_source const& source,
                                               std::string const& delimiter,
                                               parse_options options,