workflows: prevent BrewTestBot from pinging itself (#19887)
workflows: prevent BrewTestBot from pinging itself (#19887)

This commit fixes the request bottles workflow by detecting whether
BrewTestBot initiated the bottle request, and if that was the case, then
the issue or pull request creator should be pinged, and not BrewTestBot.
Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core