[2288] Make IconLabel a react flow node

[gcoutable]

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[mcharfadi]

Maybe we could precise the node.extent to avoid the node being moved at the same position as the label of the parent node.

[gcoutable]

Maybe we could precise the node.extent to avoid the node being moved at the same position as the label of the parent node.

With #288 node will be able to move anywhere, so, I think the node.extent will not be used at all

[mcharfadi]

I'm not able to hide the Icon Label Nodes, if we can't hide them we should not have the action in the toolbar.

[mcharfadi]

There is a small issue regarding layout when hiding all the IconLabel of a node
https://github.com/eclipse-sirius/sirius-web/assets/121878084/446a8af6-27c3-4b42-a528-8ce8467d6001

[gcoutable]

There is a small issue regarding layout when hiding all the IconLabel of a node https://github.com/eclipse-sirius/sirius-web/assets/121878084/446a8af6-27c3-4b42-a528-8ce8467d6001

A fix to that issue is included in the next PR.
We may merge the next PR (which can include this one) directly

[gcoutable]

I am closing this PR because it includes layout regressions that have been fixed in the next PR (#2315), and #2315 includes the commit from this PR.
I have done that to prevent the staging instance from having a state with an issue.