Envoy 1.19 release

[codefromthecrypt]

• [x] perform release workflow after envoy publishes v1.19.0
  • [x] v1.19.0
  • [x] v1.19.0_debug
• [x] If no one else did it yet, update homebrew, converting the current formula to 1.18
  • [x] https://github.com/Homebrew/homebrew-core/pull/81490
• [x] once brew upgrade envoy shows the right version, perform release workflow for v1.19.0 again to add OS/x
• [x] update the last known version in func-e so docs advertise 1.19.0