[YDBOcto#948] Remove `REPLACE` function redefinition and make use of Octo's REPLACE function

This change is in preparation for YDBOcto!1523 which makes Octo not allow drop statements on tables and function in octo_seed.sql. The drop statement executed for REPLACE function in _YDBOCTOVISTAF.sql will generate the following error after Octo's changes are merged.

4: # [ERROR]: ERR_INVALID_DROP: Dropping "replace" is disallowed as it is a system object
4: # [ERROR]: ERR_CANNOT_CREATE_FUNCTION: Function "replace(VARCHAR, VARCHAR, VARCHAR)" already exists with same argument types

REPLACE function definition and its M implementation defined in YDBOctoVistA is removed by this change as the needed functionality is provided by Octo. Its usage is tested by TVD003 in the pipeline.