fix(test): Fix the broken Sync v3 signin tests (#5778), r=@vbudhram
fix(test): Fix the broken Sync v3 signin tests (#5778), r=@vbudhram


shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server