Updates to checklist and release status template

[adamfarley]

Various updates to the checklist and release status template, including:

• Adding aarch alpine-Linux to jdk21+ in the release status template
• Adding jdk23 to the release status template
• Updating aarch32 jdk8u upstream source repo link and mirror job link in release checklist
• Remove expired reference to Adoptium API Model Constants from release checklist
• Add temurin-updater check to release checklist
• Misc tidying