Switch to CentOS Stream 10

[AshwinHIBM]

Use CentOS Stream 10 instead of CentOS 10 and get it from quay.io. This PR also includes some minor code style changes.

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[clnperez]

This is probably fine, just want you to confirm whether or not we still need the target substitution in all these places.

[clnperez]

we may be able to skip these checks now. iirc the old builds were using the now-deprecated dockerhub images, but it looks like the official build repo has moved to the quay repos. https://github.com/docker/docker-ce-packaging/blob/master/rpm/centos-10/Dockerfile#L6
looking at the script though, maybe this part has to stay as-is. i don't see where that TARGET gets used from a quick look

[AshwinHIBM]

I think I know why we still need it. It's best I order it so that we're on the same page :) The most important step would be step 5.

1. We get the list of distributions to be built: https://github.com/ppc64le-cloud/docker-ce-build/blob/main/get-env.sh#L69
2. We split and take the first part, here, CentOS and store it in DISTRO_NAME https://github.com/ppc64le-cloud/docker-ce-build/blob/main/build-containerd.sh#L48
3. We take the second part, here, 10 and store it in DISTRO_VERS https://github.com/ppc64le-cloud/docker-ce-build/blob/main/build-containerd.sh#L49
4. Now build containerd: https://github.com/ppc64le-cloud/docker-ce-build/blob/main/build-containerd.sh#L86
5. The target will be used here https://github.com/docker/containerd-packaging/blob/main/Makefile#L111