Add WorkspacesAgentConfigSettings step to the Workspaces Settings Module

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MR: Pending

NOTE: We need to decide on the proper field, max_hours_before_termination_limit may not be the best choice anymore

Description

Add WorkspacesAgentConfigSettings step to the Workspaces Settings Module. The related UI for editing agent config settings will be added by UX: Move GitLab Agent config to UI element (#457760)

• See Workspaces Settings Configuration Infrastructur... (&14186) for overview and more context
• See Related Issues and MRs section in that epic for related issues and MRs

Acceptance Criteria

• Decide the appropriate field. See gitlab-org#14186 (comment 2066748871) for relevant discussion.
• Add step for WorkspacesAgentConfigReader, after CurrentSettingsReader
• Fully exercise new behavior in spec/lib/remote_development/settings/settings_integration_spec.rb
• Add any places which directly read from table to instead read from settings module.
• Adds documentation

Technical Requirements

• This will extend support for max_hours_before_termination_limit to the agent config level.
• This will involve adding a new AgentSettings step to the Workspaces ROP Settings Module chain
• This doesn't involve creating any GraphQL API for that field, that will be done as part of the following UX issue

Design Requirements

None, no UI-facing changes.