[op-node] Check that BlockNumber is non-nil in the receipt validation

[mdehoog]

Description

We saw op-node panic in an internal PoA testnet, I believe due to a reorg that happened during a deploy (having multiple PoA signers with the same key during the deploy). This caused some of the tx receipts returned from the L1 have a null blockNumber value, causing a panic: runtime error: invalid memory address or nil pointer dereference error.

Tests

There doesn't appear to be any existing tests for this logic, but happy to add some if I'm missing where those are.

Additional context

Stacktrace:

[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xe276b4]
panic: runtime error: invalid memory address or nil pointer dereference

goroutine 217 [running]:
math/big.(*Int).Uint64(...)
	/usr/local/go/src/math/big/int.go:384
github.com/ethereum-optimism/optimism/op-node/sources.makeReceiptsFn.func1({0xc0038d7780?, 0x1371e40?, 0x19?}, {0xc0003899f8, 0x1, 0x1})
	/app/op-node/sources/receipts.go:33 +0xd8
github.com/ethereum-optimism/optimism/op-node/sources.(*IterativeBatchCall[...]).Result(0xc003aa8000)
	/app/op-node/sources/batching.go:170 +0x169
github.com/ethereum-optimism/optimism/op-node/sources.(*EthClient).FetchReceipts(0xc000180140, {0x1718b80, 0xc0038fad80}, {0x5f, 0xb0, 0x7e, 0x59, 0x1c, 0x67, 0x50, ...})
	/app/op-node/sources/eth_client.go:265 +0x1fc
github.com/ethereum-optimism/optimism/op-node/rollup/derive.PreparePayloadAttributes({0x1718b80?, 0xc0038fad80?}, 0xc0002e2438, {0x7ff8045043e8?, 0xc00007e0c0?}, {{0xd9, 0xe6, 0x83, 0xa9, 0x9d, ...}, ...}, ...)
	/app/op-node/rollup/derive/attributes.go:34 +0x97
github.com/ethereum-optimism/optimism/op-node/rollup/driver.(*Sequencer).StartBuildingBlock(_, {_, _}, {{0xd9, 0xe6, 0x83, 0xa9, 0x9d, 0x31, 0x31, ...}, ...}, ...)
	/app/op-node/rollup/driver/sequencer.go:53 +0x50b
github.com/ethereum-optimism/optimism/op-node/rollup/driver.(*Sequencer).CreateNewBlock(_, {_, _}, {{0xd9, 0xe6, 0x83, 0xa9, 0x9d, 0x31, 0x31, ...}, ...}, ...)
	/app/op-node/rollup/driver/sequencer.go:100 +0x105
github.com/ethereum-optimism/optimism/op-node/rollup/driver.(*Driver).createNewL2Block(0xc0003f4000, {0x1718b80, 0xc003a3cc00})
	/app/op-node/rollup/driver/state.go:161 +0x789
github.com/ethereum-optimism/optimism/op-node/rollup/driver.(*Driver).eventLoop(0xc0003f4000)
	/app/op-node/rollup/driver/state.go:270 +0x5ce
created by github.com/ethereum-optimism/optimism/op-node/rollup/driver.(*Driver).Start
	/app/op-node/rollup/driver/state.go:79 +0x85

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[mslipper]

Authorized the build, should be green in a minute.

[tynes]

This should be safe to merge