images: add scripts to download datadog-ci and sccache in debian packages images + enable kisscache

What

This MR refactor some parts of the Dockerfile for debian packages to install datadog-ci and sccache using two scripts.

These scripts are going to be re-used across all our images streamlining this process and centralizing version handling.

I also enable kisscache for this image setting up two env vars used by opam. However, to use kisscache we need an opam > 2.1 shipped in bookworm, so I added also a script to download and install opam. There is a small quirk in the way opam picks up env variables. It see that if I don't export the variables in the build script, they are ignored.

Why

How

The new script is very similar to another script we already use to download and install datagod-ci images/scripts/install_datadog_static.sh

I download the release and check the sha256 for both archs.

In a next MR I'll use the kiss-fetch.sh instead of curl to download these binaries from our proxy.

Manually testing the MR

check if the packages dependencies pipelines a still built correctly.

I've also run a scheduled pipeline to check this change across all the test matrix.

https://gitlab.com/tezos/tezos/-/pipelines/1866029730

To check kisscache at work, look at the logs of this job:

https://gitlab.com/tezos/tezos/-/jobs/10276466857

#21 320.2 Kisscache hits              : 203
#21 320.2 Kisscache errors            : 0
#21 320.2 Fallback to mangled URL     : 0
#21 320.2 Direct download failures    : 0

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR