[1796] Remove duplicated code for diagram and ViewUsage creation

[amontagne]

PLEASE READ ALL ITEMS AND CHECK ONLY RELEVANT CHECKBOXES BELOW

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[AxelRICHARD]

Could you please:

• add an entry in the changelog
• update the copyrights of the modified files by adding 2026 (see recent modifications to see how it has been done)

[AxelRICHARD]

I will merge the PR when the build will be successful.
Thank you for this first contribution!

[AxelRICHARD]

It seems the build has failed.
@amontagne Could you please fix the errors?

[amontagne]

I removed an unused import and resolved the merge conflicts.