Erlang 27.x packages

[michaelklishin]

I'm filing this for visibility. A large part of the work necessary to produce Erlang 27.x packages has already been done.

Specifically, on a branch named erlang-27, patch number 3 was updated to apply to the maint-27 (the tip of Erlang 27 development), the package builds successfully on aarch64 and crypto/TLS modules are functional.

However, we cannot yet start publishing the actual packages built via Actions in rabbitmq/erlang-packages. This is because RabbitMQ is still
one pull request short for "complete Erlang 27 support" without certain performance regressions,
and because Erlang 27.1.x still has a few unresolved (or resolved but not yet shipped) bugs that
affect RabbitMQ, such as

1. SSL version matching OTP 27.1.1 erlang/otp#8908
2. SSL / TLS incompatibility when using ecdsa keys introduced in 26.5.2.3 (and 27.x) erlang/otp#8918