graph: Revert earliest_block off-by-one fix from #6340 (#6403) #11281

Job	Run time
Run integration tests	4m 31s
Subgraph Runner integration tests	3m 38s
Clippy linting	5m 24s
Build in release mode	5m 4s
Check rustfmt style	25s
Run unit tests	4m 12s
Run unit tests	3m 2s
Run integration tests	4m 31s
Clippy linting	5m 24s
Check rustfmt style	25s
Build in release mode	5m 4s
Subgraph Runner integration tests	3m 38s
	45m 18s

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