graph, store: Add env var GRAPH_STORE_INSERT_EXTRA_COLS #9207

Job	Run time
Build in release mode	59s
Run integration tests	8m 28s
Clippy linting	1m 12s
Check rustfmt style	12s
Run unit tests	11m 53s
Subgraph Runner integration tests	7m 21s
	30m 5s

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