feat: Add support for dark mode node icons and colors (#9412)

Co-authored-by: Giulio Andreini <g.andreini@gmail.com>

packages/nodes-base/nodes/DateTime/DateTime.node.ts

@@ -10,6 +10,7 @@ export class DateTime extends VersionedNodeType {
 			displayName: 'Date & Time',
 			name: 'dateTime',
 			icon: 'fa:clock',
+			iconColor: 'green',
 			group: ['transform'],
 			defaultVersion: 2,
 			description: 'Allows you to manipulate date and time values',