Checking PR #30027: zabbix: do some cleanup (Embedded Patches Compliance)

Commit da622cb - zabbix: preserve user config files across sysupgrade:

✅ No downstream raw embedded patch files modified or introduced

Commit a68f1f9 - zabbix: reorganize files dir for clarity and to better follow the FHS:

✅ Embedded patch 'admin/zabbix/patches/010-change-agentd-config.patch' contains valid Git compliance headers

Commit f38aa81 - zabbix: stop shipping sysctl.d conf in package:

✅ No downstream raw embedded patch files modified or introduced

Commit 376c3c3 - zabbix: add php8-mod-simplexml dependency to frontend:

✅ No downstream raw embedded patch files modified or introduced