chore: add false positive for zabbix agent binaries

[narharim]

Summary

• Add false positive rule for Zabbix agent system binaries

The Zabbix agent is open-source monitoring tool that triggers curl_easy, proc_s_cmdline, and proc_d_cmdline as false positives because:

1. curl_easy_init — Used by web.page.regexp, web.page.get, and web.page.perf monitoring items to fetch HTTP URLs as part of web availability checks.
2. /proc/%s/cmdline and /proc/%d/cmdline — Used by proc.num, proc.mem, and proc.cpu.util items to inspect running processes on the host being monitored.

Both behaviors are core monitoring functionality

References

• https://github.com/zabbix/zabbix
• https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/zabbix_agent

[narharim]

failing PR https://github.com/chainguard-dev/stereo/pull/90960