[PRQ#57791] Merge Request for java-jbr-xdg

MarsSeed [1] filed a request to merge java-jbr-xdg [2] into java21-jetbrains [3]: Consolidating packages, eliminating duplication. AUR/java-jbr-xdg has been abandoned for close to 18 months. It also does not align properly with how Java is configured on Arch Linux. AUR/java21-jetbrains is maintained and up-to-date. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/java-jbr-xdg/ [3] https://aur.archlinux.org/pkgbase/java21-jetbrains/