* feat: Remove support for BrowserID
* mark test only functions as such. I think we can drop MapAndThenTrait for more recent implementations of rust.
Closes: SYNC-3684
Note: this commit contains a breaking change. Previously, there was a migration that included two services with static IDs by default, but this commit adds a new migration that removes those two services and adjusts the code to account for the change.
Closes#1144
