The redis version has been bumped to version 5.0.5, but the maximum version supported on
Windows is 3.2. This can lead to failing tests, the output and behaviour can be different
(see #80516). In order to prevent such failures, the amount of times the Redis image is
used can be reduced.
This commit uses the previously added agnhost guestbook subcommand as a replacement for the
Guestbook application created by the test "should create and stop a working application".
Adds AgnhostPrivate to test/utils/image/manifest. Some tests are trying to pull
the agnhost image from the private registry, meaning that we would need to
always build and push the agnhost image to both e2e and private registry
whenever we bump its version. Decoupling them would mean that we only need
to push the image to the e2e registry.
