Use mcdsl/terminal for all password prompts

Replace direct golang.org/x/term calls with mcdsl/terminal.ReadPassword
across mciasctl (6 sites), mciasgrpcctl (1 site), and mciasdb (1 site).
Aligns with the new CLI security standard in engineering-standards.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/google.golang.org/grpc/stats/stats.go

@@ -64,15 +64,21 @@ func (s *Begin) IsClient() bool { return s.Client }
 
 func (s *Begin) isRPCStats() {}
 
-// PickerUpdated indicates that the LB policy provided a new picker while the
-// RPC was waiting for one.
-type PickerUpdated struct{}
+// DelayedPickComplete indicates that the RPC is unblocked following a delay in
+// selecting a connection for the call.
+type DelayedPickComplete struct{}
 
-// IsClient indicates if the stats information is from client side. Only Client
-// Side interfaces with a Picker, thus always returns true.
-func (*PickerUpdated) IsClient() bool { return true }
+// IsClient indicates DelayedPickComplete is available on the client.
+func (*DelayedPickComplete) IsClient() bool { return true }
 
-func (*PickerUpdated) isRPCStats() {}
+func (*DelayedPickComplete) isRPCStats() {}
+
+// PickerUpdated indicates that the RPC is unblocked following a delay in
+// selecting a connection for the call.
+//
+// Deprecated: will be removed in a future release; use DelayedPickComplete
+// instead.
+type PickerUpdated = DelayedPickComplete
 
 // InPayload contains stats about an incoming payload.
 type InPayload struct {