agent_image: Switch order of tests 4 and 5

The reason for that being:
```
The test case 5 failed due to a specific behavior when using containerd
and the snapshotter to download images. Containerd needs to fetch both
the manifest and configuration of the image. In this case, both
images`quay.io/kata-containers/confidential-containers:signed` and
`quay.io/kata-containers/confidential-containers:unsigned` have the same
IDs (sha256). Consequently, test case 4 downloaded image
`quay.io/kata-containers/confidential-containers:signed`. So, in test
case 5, when containerd detected that the image ID already existed, it
used the manifest and image name from
`quay.io/kata-containers/confidential-containers:signed` and passed it
to kata instead of
`quay.io/kata-containers/confidential-containers:unsigned`, resulting in
the use of image
`quay.io/kata-containers/confidential-containers:signed`. This explains
the error in test case 5. As a temporary measure, deleting the image
before running each test case should address this.
```
from:
https://cloud-native.slack.com/archives/C039JSH0807/p1695618313572309?thread_ts=1695591000.697989&cid=C039JSH0807

Signed-off-by: Fabiano Fidêncio <[email protected]>

integration/kubernetes/confidential/agent_image.bats

@@ -62,11 +62,6 @@ setup() {
 	[ ${#rootfs[@]} -eq 1 ]
 }
 
-@test "$test_tag Test can pull a unencrypted signed image from a protected registry" {
-	setup_signature_files
-	create_test_pod
-}
-
 @test "$test_tag Test cannot pull an unencrypted unsigned image from a protected registry" {
 	setup_signature_files
 	local container_config="$(new_pod_config "$image_unsigned_protected")"
@@ -76,6 +71,11 @@ setup() {
 	assert_logs_contain 'Validate image failed: The signatures do not satisfied! Reject reason: \[Match reference failed.\]'
 }
 
+@test "$test_tag Test can pull a unencrypted signed image from a protected registry" {
+	setup_signature_files
+	create_test_pod
+}
+
 @test "$test_tag Test can pull an unencrypted unsigned image from an unprotected registry" {
 	setup_signature_files
 	pod_config="$(new_pod_config "$image_unsigned_unprotected")"