feat: rename FlowNet-Lab to GNS3-Copilot across codebase

Update all references from FlowNet-Lab to GNS3-Copilot in package names, documentation, and logging. This includes:
- Module and package __init__.py files
- License headers and file descriptions
- Log messages and internal comments
- Remove deprecated tools: GNS3CreateAreaDrawingTool and LinuxTelnetBatchTool

The renaming aligns with the project's new branding while maintaining all existing functionality.

gns3server/agent/gns3_copilot/utils/__init__.py

@@ -1,5 +1,5 @@
 """
-FlowNet-Lab Public Model Package
+GNS3-Copilot Public Model Package
 
 This package provides reusable public models and utilities for GNS3 network automation tasks.
 It contains common functionality that can be shared across different tools and modules.