Bundle releases include pre-release library releases

The automatic bundle releases made by @adafruit-adabot include releases of libraries marked as `pre-release`. I suggest releases of the bundle marked as `stable` should only include stable library releases.

Library `pre-release` releases could either be ignored entirely or @adafruit-adabot could make `pre-release` releases of the bundle which include pre-releases of libraries.

If @adafruit-adabot can't differentiate `pre-release` from `stable` releases via GitHub's Releases, it could treat any tags on non-default branches as pre-releases.

Inizia individuando il processo automatico di release dei bundle e verificando in che modo GitHub Releases distingue le release stabili dalle pre-release e dai tag sui branch non predefiniti. Il lavoro è completato quando le release dei bundle stabili escludono le librerie pre-release, oppure quando il comportamento scelto per bundle pre-release separati è documentato e implementato.

Scritto dal modello di indicizzazione a partire dal testo della issue.