istioctl: avoid parsing strings to ints or floats for string fields #51031
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Please provide a description of this PR:
This uses reflection to check field types of our values. The performance hit should be negligible as this only runs as part of istioctl. The function turned out to be a bit more complex because we a) use a map for values instead of the struct in our IstioOperator CRD and b) protoc-gen-go does not generate proper json tags.
Fixes #50990