Add Brave Ads status headers to search.brave.com

[jsecretan]

Description:

In preparation for Brave Ads on Brave Search, it is helpful for the Brave Search backend to understand whether the requesting browser has Brave Ads enabled. As such, we should add a header to any call to Brave Search (and its associated dev/staging environments), whether originating from the main search box or the Omnibox: X-Brave-Ads-Enabled should be set to 1 when Brave Ads is enabled on the device.

This issue may provide some guidance on the best way to accomplish that: https://github.com/brave/brave-ios/issues/887

[tmancey]

@brave/ios ok if I pick this up, or would you prefer to assign to somebody else? Thanks

[iccub]

go ahead @tmancey

[tmancey]

Updated https://github.com/brave/brave-browser/wiki/Custom-Headers

[Uni-verse]

Verified using version 1.45.2 (22.11.18.20) on the following device(s):

iPhone 12 Pro -iOS 16.x iPhone X - iOS 14.x iPads - iPadOS 16.x, 15.x

Clean Profile

• Verified X-Brave-Ads-Enabled header is not appended to the request

Ads Enabled

• Verified X-Brave-Ads-Enabled header is appended to the request when using search.brave via the omnibox or the main search box

Ads Disabled

• Verified Disabling Rewards will remove the header from request