[bisq-network/bisq] Banned payment accounts (Issue #6137)

[xyzmaker123]

### Description
I was using debugger and saw a lot of records in `filterManager.getFilter().getBannedPaymentAccounts()`. Most of them contains sensitive data like email, username, phone etc. I'm pretty sure I didn't set them manually, so probably they were propagated via P2P network. It seems to be a security issue.

#### Version
1.8.6

### Steps to reproduce
Not reproduceable via UI. Use debugger, stop somewhere where `filterManager` is available and check `filterManager.getFilter().getBannedPaymentAccounts()`

### Expected behaviour
I'm not sure - propositions:
- remove banned payment accounts filtering at all, 
- not propagate this data via P2P - only locally,
- use different field to recognize account (salt?) or use has to make this data anonymous

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