Fixes #24416: Elm properties app is loaded multiple times

[clarktsiory]

https://issues.rudder.io/issues/24416

The fix consist of :

• loading the script when the group page loads, or else it will be loaded multiple times
• mounting and initializing an Elm app for node properties when the "Properties" tab content is shown
  So we just move everything related to the Elm app "earlier" in the HTML structure, from NodeGroupForm details to the main Group page.

Caveats of this is that a new Elm app will be initialized each time the "Properties" tab is shown, but changing the Elm model to re-render with every group change action is heavier (we would likely need to make Elm apps global variables, to call ports on every action from the Scala templates). We could do that in another PR.

[RaphaelGauthier]

The error no longer appears when I click on different groups, but if I click several times on the Properties tab I get a new error:

On firefox :

On chrome :

[clarktsiory]

PR updated with a new commit

[clarktsiory]

@RaphaelGauthier The error is cryptic but obviously the tab is already mounted by the Elm app so the selector nodeproperties-app is empty 😁

[Normation-Quality-Assistant]

This PR is not mergeable to upper versions.
Since it is "Ready for merge" you must merge it by yourself using the following command:
rudder-dev merge https://github.com/Normation/rudder/pull/5477
-- Your faithful QA
Kant merge: "To be is to do."
(https://ci.normation.com/jenkins/job/merge-accepted-pr/82419/console)

[clarktsiory]

OK, squash merging this PR