[BUG] `AccountManagerCompleted` and `WalletManagerCompleted` increment signerRequests counter instead of their own

[yohamta0]

Description

Both AccountManagerCompleted and WalletManagerCompleted in the Prometheus metrics service incorrectly increment s.signerRequests instead of their respective counters.

Affected files

• services/metrics/prometheus/accountmanager.go, line 52
• services/metrics/prometheus/walletmanager.go, line 52

Impact

1. dirk_account_manager_process_requests_total is registered but never incremented.
2. dirk_wallet_manager_process_requests_total is registered but never incremented.
3. dirk_signer_process_requests_total is inflated with account manager requests (lock, unlock, generate) and wallet manager requests (lock, unlock) that don't belong to it

Proposed fix

services/metrics/prometheus/accountmanager.go

func (s *Service) AccountManagerCompleted(started time.Time, request string, result core.Result) {
 	s.accountManagerProcessTimer.WithLabelValues(request).Observe(time.Since(started).Seconds())
-	s.signerRequests.WithLabelValues(request, strings.ToLower(result.String())).Inc()
+	s.accountManagerRequests.WithLabelValues(request, strings.ToLower(result.String())).Inc()
}

services/metrics/prometheus/walletmanager.go

func (s *Service) WalletManagerCompleted(started time.Time, request string, result core.Result) {
 	s.walletManagerProcessTimer.WithLabelValues(request).Observe(time.Since(started).Seconds())
-	s.signerRequests.WithLabelValues(request, strings.ToLower(result.String())).Inc()
+	s.walletManagerRequests.WithLabelValues(request, strings.ToLower(result.String())).Inc()
}