update to container v19

There should be no changes required in the crates. The only
difference is in the libgpio library, as we're using a release
and not a certain commit on the main branch.

This is the first container built with the automation, and in
the process we had to do some significant cleanup to remove
things that were not needed. Hopefully this will not trigger
any errors in the CIs.

Signed-off-by: Andreea Florescu <fandree@amazon.com>

.buildkite/autogenerate_pipeline.py

@@ -60,7 +60,7 @@
 
 # This represents the version of the rust-vmm-container used
 # for running the tests.
-CONTAINER_VERSION = "v18"
+CONTAINER_VERSION = "v19"
 # This represents the version of the Buildkite Docker plugin.
 DOCKER_PLUGIN_VERSION = "v5.3.0"