fix(Gmail Node): Do not break threads while creating drafts (#16272)

Co-authored-by: Shireen Missi <94372015+ShireenMissi@users.noreply.github.com>
Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

packages/nodes-base/nodes/Google/Gmail/v2/DraftDescription.ts

@@ -66,6 +66,13 @@ export const draftFields: INodeProperties[] = [
 		},
 		placeholder: 'Hello World!',
 	},
+	{
+		displayName: 'To reply to an existing thread, specify the exact subject title of that thread.',
+		name: 'threadNotice',
+		type: 'notice',
+		default: '',
+		displayOptions: { show: { resource: ['draft'], operation: ['create'] } },
+	},
 	{
 		displayName: 'Email Type',
 		name: 'emailType',