Respect --xcode_version=/absolute/path above everything else #26901
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In d2e8c82 we added support for setting --xcode_version to an absolute path. However, this logic is currently only exercised in certain conditions. For example, when no other copies of Xcode are available this option doesn't seem effective.
This change moves the logic for checking whether the flag is set to an absolute path to the very top. While there, remove dubious initializations of xcode_version_properties and availability.