Add retries for FirehoseEndpoint::load_blocks_by_numbers #9308

Job	Run time
Clippy linting	2m 5s
Run integration tests	5m 11s
Subgraph Runner integration tests	4m 2s
Build in release mode	1m 0s
Check rustfmt style	7s
Run unit tests	10m 57s
	23m 22s

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