Rollup merge of #69949 - rust-lang:triagebot-ping-alias, r=Mark-Simulacrum
Rollup merge of #69949 - rust-lang:triagebot-ping-alias, r=Mark-Simulacrum

triagebot.toml: add ping aliases

I think I got the syntax right.
Closes https://github.com/rust-lang/triagebot/issues/402.

r? @Mark-Simulacrum
cc @pnkfelix

aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust