[clang][driver][darwin] Switch back to using CanonicalName to identify the SDK instead of SupportedTargets (#178115) The SDK's SupportedTarget for its CanonicalName doesn't necessarily have an LLVMTargetTripleSys/LLVMTargetTripleEnvironment that matches the CanonicalName. e.g. sometimes new SDKs use arm64-apple-ios1.0 during bringup, but their CanonicalName is set to the new platform. Go back to using CanonicalName to identify the SDK as a Triple::OSType, and expose the Triple::EnvironmentType used to build the SDKPlatformInfo when SupportedTargets isn't present.
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