Deprecate IPC configs (#2168)

Co-authored-by: Stephen Buttolph <stephen@avalabs.org>

config/config.go

@@ -59,12 +59,18 @@ const (
 	chainUpgradeFileName = "upgrade"
 	subnetConfigFileExt  = ".json"
 	ipResolutionTimeout  = 30 * time.Second
+
+	ipcDeprecationMsg = "IPC API is deprecated"
 )
 
 var (
 	// Deprecated key --> deprecation message (i.e. which key replaces it)
 	// TODO: deprecate "BootstrapIDsKey" and "BootstrapIPsKey"
-	deprecatedKeys = map[string]string{}
+	deprecatedKeys = map[string]string{
+		IpcAPIEnabledKey: ipcDeprecationMsg,
+		IpcsChainIDsKey:  ipcDeprecationMsg,
+		IpcsPathKey:      ipcDeprecationMsg,
+	}
 
 	errSybilProtectionDisabledStakerWeights   = errors.New("sybil protection disabled weights must be positive")
 	errSybilProtectionDisabledOnPublicNetwork = errors.New("sybil protection disabled on public network")