Add retries for FirehoseEndpoint::load_blocks_by_numbers #9310

Job	Run time
Build in release mode	2m 4s
Subgraph Runner integration tests	8m 13s
Clippy linting	1m 5s
Run integration tests	4m 54s
Check rustfmt style	5s
Run unit tests	11m 2s
	27m 23s

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