workflows/tests: enable analytics for test bot.

Will start logging test bot steps and whether they pass or fail.

Requires Homebrew/brew#16847
Requires Homebrew/homebrew-test-bot#1025

.github/workflows/tests.yml

@@ -12,6 +12,7 @@ env:
  HOMEBREW_GITHUB_ACTIONS: 1
  HOMEBREW_NO_AUTO_UPDATE: 1
  HOMEBREW_NO_INSTALL_FROM_API: 1
+ HOMEBREW_TEST_BOT_ANALYTICS: 1
  GH_REPO: ${{github.repository}}
  GH_NO_UPDATE_NOTIFIER: 1
  GH_PROMPT_DISABLED: 1