Refactor closure capture analysis and remove collectCapturedNames

Replaces the collectCapturedNames function with a unified scanNodeForCaptures that supports both local and name modes for closure variable capture analysis. Updates all relevant call sites and improves handling of various node kinds, making closure capture logic more robust and maintainable. Also updates test WAT files to reflect changes in closure environment global naming.

Refactor closure function creation logic

Removed unused parameters and redundant local set in array rest parameter initialization. Simplified compileClosureFunctionCreation by removing the staticOffset argument, as it is no longer used.

Author: BlobMaster41