[SofaCUDA] move Qt-related code

[fredroy]

based on :

• [SofaCUDA] Reorganize files and components #5967

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[ci-depends-on https://github.com//pull/5967]
but it does not really depend on this PR....

Breaking because it change includes

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).