Cherry pick MCP improvements and fixes

• Improve MCP tool descriptions for ChatGPT compatibility 21dde31
• Bug fix for setting dml tools based on bool value as set in config 7228e60
• Expand ALL permissions in MCP describe_entities to explicit operations 3b48c49
• User provided dml-tools property serialization 3adf04f
• Honoring incoming request role in determining allowed permissions for describe-entities MCP tool 7b31e9a