Add retries for FirehoseEndpoint::load_blocks_by_numbers #9309

Job	Run time
Clippy linting	55s
Subgraph Runner integration tests	3m 47s
Run integration tests	5m 15s
Build in release mode	1m 5s
Check rustfmt style	12s
Run unit tests	8m 46s
	20m 0s

Provide feedback