[RNC-2769] Add optional prod approval step to release

[jensraaby]

This needs testing (assuming I can remember how to reference the orb by git branch)

[tomp4l]

Looks good, what's this orb used for though?

[tomp4l]

Spoke to soon, it's not valid schema 😢

[jensraaby]

Spoke to soon, it's not valid schema 😢

You're too quick! I didn't realise it would add reviewers to the PR straight away.

It looks like I can't add a conditional "job" to another job, so I'm back to square one.
The "release" job was the original deploy workflow for everything until incident-gate. I noticed with the neo facade that the template was using it, so I was hoping rather than wiring together a whole new job I'd be able to just add in the approval bit as optional (in case something else is using it and we don't want to add manual approval).

[tomp4l]

Makes sense, shame we can't do it like this, it looked sensible