fix Tenderly simulation link for double nested multisig builder script

[jackchuma]

The DoubleNestedMultisigBuilder script was incorrectly sharing link generation logic with NestedMultisigBuilder resulting in disregarded state diff(s) for the child signer contract. This is needed for Upgrade 15 which is planned to be executed tomorrow. As a result of the time crunch, I just copy/pasted the relevant functions into DoubleNestedMultisigBuilder that are seen below. These are taken / modified from NestedMultisigBase.sol. Some logic is still shared so this can be refactored in a later PR.

Here's the diff for relevant functions that were modified while adding to DoubleNestedMultisigBuilder

[cb-heimdall]

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