Checking PR #30027: zabbix: do some cleanup (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (pr-zabbix-do-some-cleanup)

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

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✅ Commit subject layout and length are valid: "zabbix: preserve user config files across sysupgrade"
✅ Commit description lines adhere to width formatting rules
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Commit a68f1f9 - zabbix: reorganize files dir for clarity and to better follow the FHS:

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

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

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✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "zabbix: add php8-mod-simplexml dependency to frontend"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a valid 'Signed-off-by:' line matching author or committer
✅ Excellent! Commit contains a valid cryptographic signature (GPG/SSH). Thank you for signing your work! (Verified via GitHub Profile)
⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.