Velocity errors are not precise enough

[jirijakes]

Velocity errors should contain more details about their origin. Current shape:

CoreAccountingError - ManualTransaction:
ManualTransactionError - CalaError:
LedgerError - VelocityError:
VelocityError - Enforcement:
Velocity limit 019960ca-4802-7eb3-bb2c-967049289c3c exceeded for account 019960cb-829e-7961-9d13-3ec03ecb8cb3 - Limit: USD 0, Requested: 155

See also https://github.com/GaloyMoney/lana-bank/pull/2722#discussion_r2361996707.

[j-kon]

Hi, I traced where VelocityError::Enforcement is created. Right now the Display output drops useful context. I can open a small PR to include the key existing fields in the error string. Would that be welcome?