refactor(semantic): simplify `ScopeTree::iter_bindings` #27186

Job	Run time
Benchmark (lexer)	1m 31s
Benchmark (parser)	1m 48s
Build Linter Benchmark	3m 5s
Benchmark (transformer)	2m 30s
Benchmark (isolated_declarations)	3m 43s
Benchmark (semantic)	1m 42s
Benchmark (minifier)	2m 15s
Benchmark (codegen)	2m 24s
Benchmark linter (0)	3m 13s
Benchmark linter (1)	2m 32s
Upload benchmarks	27s
	25m 10s

Provide feedback