Add Account - Should group accounts addition of EVM accounts

[gomesalexandre]

Overview

Currently it is possible to add acounts for each chain, separately:

In contrast, Ledger adds all for EVM chains (note, Ethereum really refers to EVM chains here):

We want the "Add Account" button to act similar to the add EVM accounts for Ledger, adding all accounts for the specified account number.

Note, this issue is blocked by #6672 and assume we have removed the auto-not-so-magical account numbers discovery and should be tackled after, so that we don't end up in a scenario with the current automagical discovery, where we try to add e.g account 3 for all, but some EVM chains already have accounts 0-5, some have 0, some have 0-1 etc

References and additional details

https://github.com/shapeshift/web/blob/develop/src/pages/Accounts/AddAccountModal.tsx

Acceptance Criteria

• All EVM accounts are now living under an "Ethereum (+ x more, where x is the amount of other EVM chains we support)" option
• Adding "EVM accounts" adds all EVM accounts for said account number
• The copy is reflected in the Ledger chains connection screen as well, which is doing the same

Need By Date

No response

Screenshots/Mockups

No response

Estimated effort

3 hours

[0xean]

Product to take a quick pass on what the experience should look like.