Render the Merkle Tree root in the approval flow modal

We didn't add the merkle root during the first iteration because the `copy` feature was blocked and so there was no way to copy the hash.
This is blocked until we figure out to override the listener that is disabling the `copy` or the team responsable for the Unity rendered finds a solution.

The implementation of the `CopyToClipboard` component should be something like the following:
```
subtitle={
<>

<>
{this.renderHash(merkleTreeRoot)}



),
br:

}}
/>

}
```