net/haproxy: replace legacy mailer with Lua mailers
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@fraenki is already working on this.
Since Jan 19, 2026.
cleanup
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Description
Legacy mailers are deprecated and will be removed in HAProxy 3.3:
https://www.haproxy.com/blog/announcing-haproxy-3-1#deprecated-features
Example config for Lua mailers:
https://www.haproxy.com/blog/how-to-create-powerful-customized-lua-mailers-in-haproxy
refs #5147
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