DLPX-92522 appliance-build changes for LTS upgrade to 24.04

[palash-gandhi]

These are changes required to build a 24.04 based bootstrap VM that can
be used to build packages for the 24.04 LTS upgrade project. Here are the
changes:

1. awscli is no longer available via apt & is supplied via snap
2. Stop relying on internal sources in favor of upstream packages for LTS upgrade linux-pkg#325 removes our reliance on an internal version of adoptopenjdk. appliance-build should install openjdk-8-jdk. Note that appliance-build needs to install it because building packages other than virtualization (like make-jpkg, delphix-sso-app etc) also require a JDK installed. If it was only virtualization that needed it, it would have been appropriate to make the JDK a dependency of virtualization.
3. virtualization needs docker.io installed and running and requires the delphix user added to the docker group
4. The apt package qemu is replaced by qemu-system
5. I occasionally ran into build issues like this where dpkg couldn't acquire a lock that was held by unattended-upgrades so I am adding logic to remove that package and disable that service on the buildserver.
6. I was also having trouble with ansible-check, so I chose to replace the internal gradle task with a Github action.

Testing done

I created a bootstrap image and was able to build all packages:
https://ops-jenkins.eng-tools-prd.aws.delphixcloud.com/job/linux-pkg/job/os-upgrade/job/build-packages/job/pre-push/14/console