Delete remote_development_agent_configs table

MR:

• Finalize BackfillRootNamespaceClusterAgentMappi... (!170341 - merged)
• Delete remote_development_agent_configs table (!164032 - merged)

Description

Delete remote_development_agent_configs table.

This is a follow-up issue to Switch from remote_development_agent_configs ta... (#480135 - closed), to be completed in %17.5 after the initial table migration is completed in %17.4

This is currently blocked until we finalize this: Finalize BackfillRootNamespaceClusterAgentMappi... (!170341 - merged)

According to Migration ordering 17.1+ we cannot drop the table and finalize migrations in the same release.

Acceptance Criteria

• Any background migration that relies on this table has been finalized
• Table is deleted
• db/docs/remote_development_agent_configs.yml is deleted

Technical Requirements

Ensure there are no impacts on the API, perform exploratory testing of Workspaces functionality.

Design Requirements

N/A, no changes required.