Assert height to hash in contains block

[almogdepaz]

Purpose:

use the height to hash when checking for "contains_block" block that way we always get the relevant block for the fork
and create better separation between Augmentedblockchain and the underlining blockchain.

Current Behavior:

we call contains block that checks the block_record cache, this will return true if the block is in the cache regardless if is relevant to the chain

New Behavior:

contains_block will check the height_to_hash, the AugmentedBlockchain will return true for blocks that are in the fork and the underlining will return true only for blocks that are in the current chain

Testing Notes: