Unlisted theme submissions are not signed through the new auto-approval flow

[AlexandraMoga]

Follow up for #7047

Describe the problem and steps to reproduce it:

1. Log in to AMO -dev
2. Submit a new unlisted theme (package or wizard)
3. Wait for it to be approved/signed

What happened?

The theme is not signed

What did you expect to happen?

Theme is signed after a short while

Anything else we should know?

@diox

• these might happen because we do not have an auto-approval workflow for themes (?)
• I've checked with stage and unlisted themes are being signed through the old process

Example of un-signed unlisted theme:
https://addons-dev.allizom.org/en-US/developers/addon/47e5641ef28f4322a95d/versions/1689761

[diox]

Yeah forgot that unlisted themes were a thing...

[AlexandraMoga]

Verified fixed on stage. Unlisted themes are now signed in a short while after submission. Listed themes are still going through the normal manual approval flow.

Example of a theme with both unlisted (approved) and listed (awaiting review) versions:
https://addons.allizom.org/en-US/developers/addon/mixed-version-theme/versions