Variations not sending the right channel from Brave-Core

[Brandon-T]

Description:

• Add a channel to release builds so Variations works temporarily until we fix Brave-Core's channel settings

Steps to Reproduce

1. Test variations

Actual result:

• Seed studies are not applied

Expected result:

• Seed studies should be applied

Reproduces how often: [Easily reproduced, Intermittent Issue]

• Easily reproduced

Brave Version:

• 1.62.x