'Add tracking variable declarations' happens twice

[IFcoltransG]

The compiler has two separate steps that add variable declarations for each tracking node:
https://github.com/YarnSpinnerTool/YarnSpinner-Rust/blob/main/crates/compiler/src/compiler/run_compilation.rs#L20-L21

        &create_declarations_for_tracking_nodes,
        &add_tracking_declarations,

The code for both steps is almost identical, with one cloning an iterator, and the other collecting into a Vec and cloning that.

• https://github.com/YarnSpinnerTool/YarnSpinner-Rust/blob/main/crates/compiler/src/compilation_steps/create_declarations_for_tracking_nodes.rs
• https://github.com/YarnSpinnerTool/YarnSpinner-Rust/blob/main/crates/compiler/src/compilation_steps/add_tracking_declarations.rs

Rather than add the declarations twice, one of these compilation steps should be deleted.