Changes to Start login flow

added the new optional request property browser

added the new optional request property browser_telemetry/browser/control/cdp

added the new optional request property browser_telemetry/browser/platform

added the new optional request property browser_telemetry/export

added the new optional request property browser_telemetry/storage

added the new optional request property skill_mode

request property browser_telemetry deprecated

request property proxy deprecated

added the new optional request property browser_telemetry