Delete old remote_development_agent_configs table

MR: Pending

Description

This is a follow-up from #480135 (closed) to delete the old remote_development_agent_configs table.

It should be performed in the next milestone after the new workspaces_agent_configs table was introduced (%17.5 )

Acceptance Criteria

• Old table is deleted

Technical Requirements

See Switch from remote_development_agent_configs ta... (#480135 - closed) for more context on this change

Design Requirements

N/A, no UI changes.