Wire up Entity MCP config with IsToolEnabled

[souvikghosh04]

The entity-level MCP configuration (Entity.Mcp.DmlToolEnabled) defaults to true when null/unspecified due to the changes we made. However, this property is not currently being checked by the MCP tools when they execute. The tools only check the runtime-level configuration (RuntimeConfig.McpDmlTools.ReadRecords, etc.).

The integration work to actually use the entity-level settings in the IsToolEnabled checks will need to be done.