refactor(transformer): rename `VarDeclarationsStore` methods #18660

Job	Run time
Benchmark (lexer)	1m 38s
Build Linter Benchmark	2m 58s
Benchmark (parser)	2m 0s
Benchmark (transformer)	2m 0s
Benchmark (isolated_declarations)	1m 56s
Benchmark (semantic)	1m 54s
Benchmark (minifier)	2m 55s
Benchmark (codegen)	1m 53s
Benchmark (sourcemap)	1m 48s
Benchmark linter (0)	3m 25s
Benchmark linter (1)	1m 55s
Upload benchmarks	17s
	24m 39s

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