Update license headers for ELEMENTS codebase

The advice documented in the section Copyright Guidelines:
https://www.hyland.com/en/brand-central/guidelines/nuxeo-interim-guidelines
needs to be prioritized in the code, license files and/ or documentation.

AC
Anywhere in our code, documentation, license files

• Remove any sentence that mentions copyright given to Nuxeo, Nuxeo Corp, Nuxeo SAS, or anything similar
• Replace with this sentence:
  ©2023 Hyland Software, Inc. and its affiliates. All rights reserved. All Hyland product names are registered or unregistered trademarks of Hyland Software, Inc. or its affiliates.