Add max_workspaces and max_workspaces_per_user fields

What does this MR do and why?

Add max_workspaces and max_workspaces_per_user field to remote_development_agent_configs

Related to DB: Add workspaces_quota and workspaces_per_use... (#426511 - closed)

Migration output

$ bin/rails db:migrate:up:main VERSION=20231114062200 RAILS_ENV=development
main: == [advisory_lock_connection] object_id: 184200, pg_backend_pid: 481889
main: == 20231114062200 AddMaxWorkspacesToRemoteDevelopmentAgentConfigs: migrating ==
main: -- add_column(:remote_development_agent_configs, :max_workspaces, :bigint, {:default=>-1, :null=>false})
main:    -> 0.0026s
main: == 20231114062200 AddMaxWorkspacesToRemoteDevelopmentAgentConfigs: migrated (0.0058s) 
main: == [advisory_lock_connection] object_id: 184200, pg_backend_pid: 481889

$ bin/rails db:migrate:down:main VERSION=20231114062200 RAILS_ENV=development
main: == [advisory_lock_connection] object_id: 184060, pg_backend_pid: 482233
main: == 20231114062200 AddMaxWorkspacesToRemoteDevelopmentAgentConfigs: reverting ==
main: -- remove_column(:remote_development_agent_configs, :max_workspaces, :bigint, {:default=>-1, :null=>false})
main:    -> 0.0011s
main: == 20231114062200 AddMaxWorkspacesToRemoteDevelopmentAgentConfigs: reverted (0.0042s) 
main: == [advisory_lock_connection] object_id: 184060, pg_backend_pid: 482233


$ bin/rails db:migrate:up:main VERSION=20231114062215 RAILS_ENV=development
main: == [advisory_lock_connection] object_id: 184180, pg_backend_pid: 482701
main: == 20231114062215 AddMaxWorkspacesPerUserToRemoteDevelopmentAgentConfigs: migrating 
main: -- add_column(:remote_development_agent_configs, :max_workspaces_per_user, :bigint, {:default=>-1, :null=>false})
main:    -> 0.0020s
main: == 20231114062215 AddMaxWorkspacesPerUserToRemoteDevelopmentAgentConfigs: migrated (0.0061s) 
main: == [advisory_lock_connection] object_id: 184180, pg_backend_pid: 482701

$ bin/rails db:migrate:down:main VERSION=20231114062215 RAILS_ENV=development
main: == [advisory_lock_connection] object_id: 184180, pg_backend_pid: 483230
main: == 20231114062215 AddMaxWorkspacesPerUserToRemoteDevelopmentAgentConfigs: reverting 
main: -- remove_column(:remote_development_agent_configs, :max_workspaces_per_user, :bigint, {:default=>-1, :null=>false})
main:    -> 0.0011s
main: == 20231114062215 AddMaxWorkspacesPerUserToRemoteDevelopmentAgentConfigs: reverted (0.0045s) 
main: == [advisory_lock_connection] object_id: 184180, pg_backend_pid: 483230

How to set up and validate locally

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