Drop duplicate legal headers in ods-charts.js

[julien-deramond]

Description

When running npm run build, dist/ods-charts.js is generated.
Due to the legal headers in all TypeScript files, dist/ods-charts.js contains several times the following header within the file:

//
// Software Name: Orange Design System Charts
// SPDX-FileCopyrightText: Copyright (c) 2023 Orange SA
// SPDX-License-Identifier: MIT
//
// This software is distributed under the MIT license.
//

Expected: only one legal header should be displayed at the top of dist/ods-charts.js when generated.