[email protected]: make main Python formula

[fxcoudert]

Splitting off #63346 into two pull requests, to merged merged simultaneously. This is 2/2.

Do not merge without #63526

[fxcoudert]

Restarting CI because the 10.14 nodes were updated and restarted

[fxcoudert]

10.13:

brew test --retry --verbose buku
brew install --only-dependencies fail2ban
brew test --retry --verbose glyr
brew test --retry --verbose pcl
brew test --retry --verbose stellar-core

10.14:

brew install --only-dependencies fail2ban
brew test --retry --verbose glyr
brew test --retry --verbose libcouchbase
brew test --retry --verbose pcl

10.15:

brew install --only-dependencies fail2ban
brew test --retry --verbose glyr
brew test --retry --verbose ngs
brew test --retry --verbose pcl

---

• fail2ban is due to this being separate from the [email protected] keg-only PR
• the other three are known test failures