Fix backfill block size off-by-1

[mkysel]

Fix backfill block size off-by-1 error in RpcLogStreamer.GetNextPage method to ensure exactly backfillBlockPageSize blocks are queried per page

The toBlock calculation in the GetNextPage method of RpcLogStreamer is corrected by subtracting 1 from fromBlockNumber + r.backfillBlockPageSize to prevent querying one extra block per page. A comment is added to explain the fix in rpc_log_streamer.go.

📍Where to Start

Start with the GetNextPage method in rpc_log_streamer.go.

Changes since #903 opened

• Corrected block range calculations in RPC log streamer test mocks [fff8f24]
• Updated backfill page size configuration [fff8f24]
• Modified test assertion methods for type flexibility [fff8f24]

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Macroscope summarized fff8f24.

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