Re-enable tests for tf.einsum().
Re-enable tests for tf.einsum().

These tests check that tf.einsum() is equivalent to np.einsum().
At one point, some of them were failing because of a bug in
np.einsum() in an old version of numpy.  This bug has been fixed,
so we can re-enable the tests now.

PiperOrigin-RevId: 217370167

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