store: Fix iterator bug in fields_exist_in_dest for multi-column indexes #11208

Job	Run time
Build in release mode	1m 34s
Run unit tests	3m 57s
Run integration tests	4m 22s
Check rustfmt style	14s
Clippy linting	2m 0s
Subgraph Runner integration tests	3m 17s
	15m 24s

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