core: Remove error return from IndexingContext.revert_data_sources #11326

Job	Run time
Clippy linting	1m 47s
Run integration tests	4m 37s
Run unit tests	2m 37s
Build in release mode	1m 41s
Check rustfmt style	17s
Subgraph Runner integration tests	3m 46s
	14m 45s

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