chore: add [Chore] automatically to chore issues created from template

[JamesLMilner]

Description of Changes

Tiny PR to automatically prefix chore issues with [Chore]

Link to Issue

No issue

PR Checklist

• [x] The PR title follows the conventional commit standard
• [ ] There is a associated GitHub issue
• [ ] If I have added significant code changes, there are relevant tests
• [ ] If there are behaviour changes these are documented