Corretto is transitioning from using release branches to tags

[satyenme]

Currently, when a new version of the Corretto JDK is released, the commit is tagged and a corresponding release-<version> branch is created. To maintain a cleaner repository, the Corretto JDK team will gradually discontinue creating release branches and rely solely on tags.

As part of this transition, on December 18, we will delete all release branches that are more than two releases old. Starting in April 2025, we will no longer create release branches at all; only tags will be used to mark released code.

Customers can still check out the released code by using the release tags.