Remove unused tensor dumper functions (#24821)
### Description
Remove unused tensor dumper functions.
Those functions are not needed any more since it is easy to make a
string with `::onnxruntime::MakeString` like in `DUMP_CPU_STRING`
macros.
### Motivation and Context
Follow up with
https://github.com/microsoft/onnxruntime/pull/24813#discussion_r2096803842.
Some functions were added, but not used any more. Remove them to avoid
maintenance cost.
