fix(Slack Node): Restore ability to send text in addition of blocks or attachments

packages/nodes-base/nodes/Slack/V2/MessageDescription.ts

@@ -331,6 +331,21 @@ export const messageFields: INodeProperties[] = [
 		hint: "To create blocks, use <a target='_blank' href='https://app.slack.com/block-kit-builder'>Slack's Block Kit Builder</a>",
 		default: '',
 	},
+	{
+		displayName: 'Notification Text',
+		name: 'text',
+		type: 'string',
+		default: '',
+		displayOptions: {
+			show: {
+				operation: ['post'],
+				resource: ['message'],
+				messageType: ['block'],
+			},
+		},
+		description:
+			'Fallback text to display in slack notifications. Supports <a href="https://api.slack.com/reference/surfaces/formatting">markdown</a> by default - this can be disabled in "Options".',
+	},
 	{
 		displayName: 'This is a legacy Slack feature. Slack advises to instead use Blocks.',
 		name: 'noticeAttachments',