Rework year in file header

[evegufy]

Description

Change the year in the file header to year when the file was created as the current setup with year,year format requires to update the file header in every year that the file is changed.

To be done for the following repos:

• https://github.com/eclipse-tractusx/portal
• https://github.com/eclipse-tractusx/portal-frontend
• https://github.com/eclipse-tractusx/portal-frontend-registration
• https://github.com/eclipse-tractusx/portal-shared-components
• https://github.com/eclipse-tractusx/portal-backend
• https://github.com/eclipse-tractusx/portal-assets
• https://github.com/eclipse-tractusx/portal-iam

Also, check with FOSS expert for updating the according TRG 7.02