refactor(language_server): simplify IsolatedLintHandler #25368

Job	Run time
Build Linter Benchmark	2m 36s
Benchmark (lexer)	1m 14s
Benchmark (parser)	1m 32s
Benchmark (transformer)	2m 4s
Benchmark (isolated_declarations)	2m 16s
Benchmark (semantic)	1m 31s
Benchmark (minifier)	2m 9s
Benchmark (codegen)	1m 59s
Benchmark linter (0)	3m 9s
Benchmark linter (1)	1m 49s
Upload benchmarks	22s
	20m 41s

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