Review Github settings on drupal/* projects - set immutable releases

Problem/Motivation

Drupal uses Github as part of our delivery toolset. Github offers immutable releases (basic docs and how to documentation) to make releases more reliably durable. We should configure immutable releases for all projects where it would be helpful.

Steps to reproduce

See immutable settings are not enabled.

Proposed resolution

Enable them.

Remaining tasks

Confirm this is possible on different repositories.
Enable it.

User interface changes

n/a

API changes

n/a?

Data model changes

n/a