refactor: Add telemetry for RBAC (no-changelog) (#8056)

https://linear.app/n8n/issue/PAY-1142

packages/cli/src/databases/repositories/role.repository.ts

@@ -12,4 +12,23 @@ export class RoleRepository extends Repository<Role> {
 	async findRole(scope: RoleScopes, name: RoleNames) {
 		return this.findOne({ where: { scope, name } });
 	}
+
+	/**
+	 * Counts the number of users in each role, e.g. `{ admin: 2, member: 6, owner: 1 }`
+	 */
+	async countUsersByRole() {
+		type Row = { role_name: string; count: number };
+
+		const rows: Row[] = await this.createQueryBuilder('role')
+			.select('role.name')
+			.addSelect('COUNT(user.id)', 'count')
+			.innerJoin('user', 'user', 'role.id = user.globalRoleId')
+			.groupBy('role.name')
+			.getRawMany();
+
+		return rows.reduce<Record<string, number>>((acc, item) => {
+			acc[item.role_name] = item.count;
+			return acc;
+		}, {});
+	}
 }