refactor(ast, regular_expression): shorten `ContentEq` implementations #26498

Job	Run time
Build Linter Benchmark	2m 41s
Benchmark (lexer)	1m 20s
Benchmark (parser)	1m 30s
Benchmark (transformer)	2m 10s
Benchmark (isolated_declarations)	2m 0s
Benchmark (semantic)	2m 32s
Benchmark (minifier)	3m 8s
Benchmark (codegen)	2m 5s
Benchmark linter (0)	3m 23s
Benchmark linter (1)	1m 53s
Upload benchmarks	14s
	22m 56s

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