tests(integration): move most test inside groups.

tests/integration/df.bats

@@ -1,26 +0,0 @@
-#!/usr/bin/env bats
-# apparmor.d - Full set of apparmor profiles
-# Copyright (C) 2024 Alexandre Pujol <alexandre@pujol.io>
-# SPDX-License-Identifier: GPL-2.0-only
-
-load common
-
-@test "df: Display all filesystems and their disk usage" {
-    df
-}
-
-@test "df: Display all filesystems and their disk usage in human-readable form" {
-    df -h
-}
-
-@test "df: Display the filesystem and its disk usage containing the given file or directory" {
-    df apparmor.d/
-}
-
-@test "df: Include statistics on the number of free inodes" {
-    df --inodes
-}
-
-@test "df: Display filesystem types" {
-    df --print-type
-}