Fix accuracy metric #50310
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Fix accuracy metric #50310
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This reverts commit 256d44d4525bcd3f130cf49690271bfd030db727.
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This PR fixes per-class accuracy calculation by taking into account per-class true negatives.
Additionally:
actual_classestoclassesinaccuracymetric for consistency withprecisionandrecallmetricsAccuracyimplemented using 'MulticlassConfusionMatrix`SetOnce<>wrapper in classification metrics classes in order to increase code readabilityRelates #48759