Fixed the iOS simulator pre-boot on CI - #119
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Re-enabled the simulator pre-boot step, it now also pre-installs and warms the WebDriverAgent which should speed up the start of each test run
Did a bunch of testing and tuning around the boot sequence (including concurrency, gated stages, and a few other things) and with the boot-install approach doing things serially seems to be the fastest as CPU contention drastically slows dow the WebDriverAgent setup process.
Starting and warming the 12 simulators takes ~210s