feat(wallets): reuse `session_id` across multiple `TrezorSigner`

### Component

Forge

### Describe the feature you would like

https://github.com/foundry-rs/foundry/blob/398ef4a3d55d8dd769ce86cada5ec845e805188b/crates/wallets/src/multi_wallet.rs#L369-L375

Currently, every new instance of `TrezorSigner` is created with their own `session_id`. If a passphrase is enabled on the device, it means requesting it for every mnemonic index.

Ideally, each `TrezorSigner` reuses the first created `session_id`.

### Additional context

_No response_

Start in crates/wallets/src/multi_wallet.rs at the linked lines 369-375 and trace how each TrezorSigner receives its session_id. The change is complete when multiple TrezorSigner instances reuse the first session_id instead of requesting a passphrase for every mnemonic index.

Written by the indexing model from the issue text.