Configured Forced Response Character Encoding for CAE

To prevent SRI mismatches due to incorrect character encoding, the CAE is now configured to force character encoding by default. Also see https://docs.spring.io/spring-boot/appendix/application-properties/index.html#application-properties.web.spring.servlet.encoding.force

(CMS-29178)

Changed Themes Target Folder Name

In the CAE local development workflow with local resources an issue has been observed where static resources were not found. Therefore, the folder `frontend/target/resources/themes` has been changed to `frontend/target/resources/Themes`. It may be necessary to delete the target folder of the frontend workspace once after upgrade.

(CMS-28937)

Correction of CAE and HLS Cache Header max-age

Cache Header max-age of resources with validity date delivered by CAE and HLS could be off by up to one second, invalidating a resource in caches too soon, i.e., before an updated version of the resource becomes available. This has been fixed by adding a second to the max-age.

(CMS-28897)