Look even more widely for IB designables agent

[1ec5]

Cast an even wider net than #12140 when trying to detect the helper process that builds the Interface Builder designable when MGLMapView is displayed in a storyboard or XIB. Detecting the helper process is important because it keeps mbgl and the telemetry subsystem from initializing and causing the designable to time out or raise an exception. The helper process has once again been renamed on each platform, according to the Xcode 10 GM seed release notes:

Some binaries used by Interface Builder have been renamed for better consistency. Instead of
“Interface Builder Cocoa Touch Tool”, “Interface Builder WatchKit Tool”, and “IBAppleTVTool”, they are now called “IBAgent-[platform]”. (35400833)

Platform SDK	Xcode 9	Xcode 10 beta 1	Xcode 10 GM seed
iOS	IBDesignablesAgentCocoaTouch	IBDesignablesAgent-iOS	IBAgent-iOS, IBDesignablesAgent-iOS
macOS	IBDesignablesAgent	IBDesignablesAgent-macOS	IBDesignablesAgent-macOS
tvOS	IBDesignablesAgentAppleTV	IBDesignablesAgent-tvOS	IBAgent-tvOS, IBDesignablesAgent-tvOS

(tvOS is mentioned here because of #9319.)

I left out the iOS changelog blurb because this fix by itself doesn’t address #10072 or #10573.

/cc @fabian-guerra @friedbunny