CA: GCE: Return UnknownArch from ToSystemArchitecture for invalid architectures #4982
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PR #4973 changed ToSystemArchitecture behavior to return DefaultArch
instead of UnknownArch for invalid architectures. This kind of defaulting
makes sense while parsing KUBE_ENV, but prevents using the function
in contexts where an invalid architecture should result in an error.
This commit reverts ToSystemArchitecture to previous behavior, and
moves defaulting to the callsite.