Add rooster release management configuration and instructions (#8567)

I'd rather not be the only one who can easily generate our changelog
entries so I invested some time to get Rooster a bit further along and
add instructions.

.github/release.yml

@@ -1,29 +0,0 @@
-# https://docs.github.com/en/repositories/releasing-projects-on-github/automatically-generated-release-notes#configuring-automatically-generated-release-notes
-changelog:
-  exclude:
-    labels:
-      - internal
-      - documentation
-  categories:
-    - title: Breaking Changes
-      labels:
-        - breaking
-    - title: Rules
-      labels:
-        - rule
-    - title: Settings
-      labels:
-        - configuration
-        - cli
-    - title: Bug Fixes
-      labels:
-        - bug
-    - title: Formatter
-      labels:
-        - formatter
-    - title: Preview
-      labels:
-        - preview
-    - title: Other Changes
-      labels:
-        - "*"