MCPClient: Remove DashboardSettings dependency
MCPClient: Remove DashboardSettings dependency

Giving the MCPClient access to the dashboard UUID via replacement dict
& environment variable was a branch of code development that was not
followed up on. Remove it to reduce table dependencies of the MCPClient.

sevein/archivematica,michal-ruzicka/archivematica,sevein/archivematica,sevein/archivematica,eckardm/archivematica,michal-ruzicka/archivematica,eckardm/archivematica,artefactual/archivematica,artefactual/archivematica,sevein/archivematica,eckardm/archivematica,michal-ruzicka/archivematica,michal-ruzicka/archivematica,artefactual/archivematica,eckardm/archivematica,artefactual/archivematica