`eth_getUncleCountByBlockHash` errors when passing a valid block hash as parameter

[arnaubennassar]

eth_getUncleCountByBlockNumber errors when passing a valid block number as parameter:

ETH JSON-RPC Spec:

https://ethereum.github.io/execution-apis/api-documentation/

[tclemos]

We have unit tests to avoid this, but looks like they were skipped:

https://github.com/0xPolygonHermez/zkevm-node/blob/743b90408c4d5abc42d964a63d30ee4181c0027b/jsonrpc/endpoints_eth_test.go#L961-L963

https://github.com/0xPolygonHermez/zkevm-node/blob/743b90408c4d5abc42d964a63d30ee4181c0027b/jsonrpc/endpoints_eth_test.go#L981-L983

https://github.com/0xPolygonHermez/zkevm-node/blob/743b90408c4d5abc42d964a63d30ee4181c0027b/jsonrpc/endpoints_eth_test.go#L1001-L1003

https://github.com/0xPolygonHermez/zkevm-node/blob/743b90408c4d5abc42d964a63d30ee4181c0027b/jsonrpc/endpoints_eth_test.go#L1021-L1023

I'll be fixing it and enabling the tests again to avoid it in the future.