Fixes #21910: Remove system update technique from Rudder

[VinceMacBuche]

https://issues.rudder.io/issues/21910

[amousset]

needs a rebase.

[VinceMacBuche]

PR rebased

[Normation-Quality-Assistant]

This PR breaks qa-test

-- stdout -- 
Branch 'branches/rudder/7.2' set up to track remote branch 'branches/rudder/7.2' from 'NRM'.
Your branch is up to date with 'NRM/branches/rudder/7.2'.
Already up to date.
Already up to date.
[...]
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
xargs: warning: options --max-args and --replace/-I/-i are mutually exclusive, ignoring previous --max-args value
make: *** [Makefile:43: test] Error 1

You should run ./qa-test in your repository to make sure it works.
You can also run rudder-dev merge https://github.com/Normation/rudder-techniques/pull/1796 --test to test with upmerging.
After this, you can remove the qa: Can't merge ta
-- Your faithful QA (https://ci.normation.com/jenkins/job/merge-accepted-pr/60690/console)