Don't check position of optional txs

[dvush]

📝 Summary

Bundle atomicity check also checks correct ordering of txs. It does not work for optional txs because they can be included outside of the bundle boundaries as part of the different bundle or even from the mempool.

This pr removes ordering check for optional txs.

Better way would be to detect if optional tx is outside of the bundle and check if its actually from the different bundle or from the mempool. But detecting it in general case is very hard because of all edge cases like bundles with all optional txs that are also part of mempool (in this case any ordering of the txs can be valid).

Alternative for the future development could be for builder to actually mark which tx is part of which bundle and then we could check if clamed arrangement is consistent.

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