Bisq: Deprecate Revolut phone numbers, require Revolut username

[wiz]

Due to the recent changes with Revolut, I feel we should make username usage mandatory. We should replace the payment account creation text validation to disallow phone numbers and only allow usernames.

cc @bisq-knight @leo816 @m52go

[ripcurlx]

We have to do it similar as we did it with the move from e-mail to phone numbers in the past to be backwards compatible. But besides that :+1:

[wiz]

Yeah, discussed with @m52go on a long call yesterday, we found your previous work, and fortunately the code is using a generic "accountId" string, so we are planning to change the string input validation.

[pingiun]

This is a duplicate of #4155