Remove staging condition from extension promo addon

[mcleinman]

Description

Get ready for this to go to prod.

Reference

VPN-6837

Checklist

• My code follows the style guidelines for this project
• I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• I have performed a self review of my own code
• I have commented my code PARTICULARLY in hard to understand areas
• I have added thorough tests where needed

[mcleinman]

Don't know why @flodolo was auto-added as a reviewer; I removed you, sorry about that.

[flodolo]

Don't know why @flodolo was auto-added as a reviewer; I removed you, sorry about that.

It's this
https://github.com/mozilla-mobile/mozilla-vpn-client/blob/main/CODEOWNERS#L1

Not sure if we could remove it now that we're using shared strings…

[mcleinman]

Don't know why @flodolo was auto-added as a reviewer; I removed you, sorry about that.

It's this https://github.com/mozilla-mobile/mozilla-vpn-client/blob/main/CODEOWNERS#L1

Not sure if we could remove it now that we're using shared strings…

PR is up to stop bugging you on these, and instead focus on the translations: #10240