Replace vue-multiselect with a custom component (#366)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/366
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

cypress/factories/task_assignee.js

@@ -0,0 +1,17 @@
+import {Factory} from '../support/factory'
+import {formatISO} from 'date-fns'
+
+export class TaskAssigneeFactory extends Factory {
+	static table = 'task_assignees'
+
+	static factory() {
+		const now = new Date()
+
+		return {
+			id: '{increment}',
+			task_id: 1,
+			user_id: 1,
+			created: formatISO(now),
+		}
+	}
+}