Add test for Pi4/5 to some of the Pi specific nodes in the hardware group

[hardillb]

fixes #1073

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Proposed changes

Add test for : Raspberry Pi in /proc/cpuinfo to pick up Pi 4 and Pi 5

Checklist

• [x] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [x] I have run grunt to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality

[hardillb]

I don't have any of this hardware to test with, but pretty sure this should do what is required.

Also it looks like the PR template had got overwritten at some point, so fixed that.

[dceejay]

Thanks Ben