refactor(transformer/arrow-functions): shorten `AstBuilder` call #25933

Job	Run time
Build Linter Benchmark	2m 40s
Benchmark (lexer)	1m 40s
Benchmark (parser)	1m 33s
Benchmark (transformer)	2m 8s
Benchmark (isolated_declarations)	2m 9s
Benchmark (semantic)	1m 58s
Benchmark (minifier)	2m 18s
Benchmark (codegen)	2m 14s
Benchmark linter (0)	3m 3s
Benchmark linter (1)	1m 43s
Upload benchmarks	22s
	21m 48s

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