Bridges: Remove obsolete relayer CLI args: host, port, path, secure (#7549)

Closes: #7291 

## Description

*Removes obsolete relayer CLI args from bridges and resolves following
issue: (https://github.com/paritytech/polkadot-sdk/issues/7291)*

---------

Co-authored-by: Branislav Kontur <bkontur@gmail.com>