Cleanup max_hours_before_termination GraphQL field outside of deprecation milestone

MR: Pending

Description

Spin-off from:

GraphQL cleanup on rails backend and frontend (#509788 - closed)

Due to recent developments preventing removal of fields deprecated on the GraphQL layer and not marked as experimental on the breaking milestone (18.0 in this case), we need to still plan for the removal of these fields in a later milestone as they currently provide no benefit ( they are not used internally for anything)

The fields in question:

• max_hours_before_termination on workspace type , and mutation

Acceptance criteria

• deprecated fields removed from GraphQL

Implementation plan