feat: allow for ExApps to use webhook_listeners without user context

[bigcat88]

Summary

For the Workflow Engine project, we need to register webhooks from the background job, where we do not have a userId.

This will also be useful in other ExApps in the future.

This special attribute that allows you to do this was added today:

#46607

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[julien-nc]

You need to change the app version to make sure the migration step runs. Apart from that: LGTM 👍

[bigcat88]

You need to change the app version to make sure the migration step runs. Apart from that: LGTM 👍

version changed from 1.0.0-dev to 1.1.0-dev

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