refactor(transformer): rename `VarDeclarationsStore` methods #23662

Job	Run time
Build Linter Benchmark	2m 49s
Benchmark (lexer)	1m 30s
Benchmark (parser)	1m 51s
Benchmark (transformer)	2m 20s
Benchmark (isolated_declarations)	1m 59s
Benchmark (semantic)	1m 52s
Benchmark (minifier)	2m 0s
Benchmark (codegen)	1m 42s
Benchmark linter (0)	3m 25s
Benchmark linter (1)	2m 11s
Upload benchmarks	31s
	22m 10s

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