Handle `qualified module level variables` as errors in compile time prompt as code

[SasinduDilshara]

Description

Currently the module level variables with Qualified names are not considered as errors in compile time prompt as code feature

https://github.com/ballerina-platform/module-ballerina-np/pull/38#discussion_r2203868601

Steps to Reproduce

This get reproduced when the LLM reponse for the compile time prompt as code contains qualified module level variables

Version

0.3.0

Environment Details (with versions)

No response