The HR Skills app no longer includes an employee certifications report that was not being used. This simplifies the app by removing obsolete report screens, files, and access rules, with no expected impact on day-to-day workflows.

The certifications report is not used anywhere, it should be completely removed

task-5388640

This update removes a method called '_get_report_date_to' from several Odoo reports. This method was previously only used for the stable version of the software and is no longer required in the main version. This cleanup improves code efficiency and maintainability.

Follow up of https://github.com/odoo/enterprise/commit/e23fad86efc0470960f6ef9768760a281cccb4de

In the above mentioned fix modification of `_get_report_date_to` method meant only for stable. This PR removes the method as it is no longer needed in master.