store: Fix iterator bug in fields_exist_in_dest for multi-column indexes #11048

Job	Run time
Run unit tests	2m 53s
Run integration tests	3m 20s
Subgraph Runner integration tests	2m 45s
Clippy linting	1m 49s
Build in release mode	1m 22s
Check rustfmt style	17s
	12m 26s

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