feat(Microsoft Outlook Node): Node overhaul (#4449)

[N8N-4995](https://linear.app/n8n/issue/N8N-4995)

---------

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

packages/nodes-base/nodes/Microsoft/Outlook/v2/methods/loadOptions.ts

@@ -0,0 +1,54 @@
+import type { ILoadOptionsFunctions, INodePropertyOptions } from 'n8n-workflow';
+import { getSubfolders, microsoftApiRequestAllItems } from '../transport';
+
+export async function getCategoriesNames(
+	this: ILoadOptionsFunctions,
+): Promise<INodePropertyOptions[]> {
+	const returnData: INodePropertyOptions[] = [];
+	const categories = await microsoftApiRequestAllItems.call(
+		this,
+		'value',
+		'GET',
+		'/outlook/masterCategories',
+	);
+	for (const category of categories) {
+		returnData.push({
+			name: category.displayName as string,
+			value: category.displayName as string,
+		});
+	}
+	return returnData;
+}
+
+export async function getFolders(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
+	const returnData: INodePropertyOptions[] = [];
+	const response = await microsoftApiRequestAllItems.call(this, 'value', 'GET', '/mailFolders', {});
+	const folders = await getSubfolders.call(this, response);
+	for (const folder of folders) {
+		returnData.push({
+			name: folder.displayName as string,
+			value: folder.id as string,
+		});
+	}
+	return returnData;
+}
+
+export async function getCalendarGroups(
+	this: ILoadOptionsFunctions,
+): Promise<INodePropertyOptions[]> {
+	const returnData: INodePropertyOptions[] = [];
+	const calendars = await microsoftApiRequestAllItems.call(
+		this,
+		'value',
+		'GET',
+		'/calendarGroups',
+		{},
+	);
+	for (const calendar of calendars) {
+		returnData.push({
+			name: calendar.name as string,
+			value: calendar.id as string,
+		});
+	}
+	return returnData;
+}