core: Remove error return from IndexingContext.revert_data_sources #11330

Job	Run time
Check rustfmt style	16s
Clippy linting	1m 25s
Run integration tests	1m 2s
Build in release mode	1m 25s
Run unit tests	1m 21s
Subgraph Runner integration tests	1m 20s
	6m 49s

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