Remove deprecations for some of the endpoints in ApiDef files. These changes

are made according to https://github.com/tensorflow/community/pull/16.

I am keeping a few symbols deprecated not mentioned in the doc:
tf.diag - it seems best to keep it next to tf.linalg.diag, so that the two are easy to compare and decide which one to use. The plan is to rename tf.diag to tf.tensor_diag.
tf.is_nan - similar to tf.is_inf, tf.is_finite, tf.is_numeric_tensor which are all getting deprecated and replaced by symbols in tf.debugging.
tf.string_to_number - other string endpoints in root namespace are getting deprecated: for e.g. tf.substr, tf.string_join.
tf.dequantize - all quantization ops should be under tf.quantize. I probably missed this one.
tf.check_numerics - similar to other debugging ops that are getting moved to tf.debugging.
tf.squared_difference - moved to tf.math namespace and not as popular as some other math ops such as tf.add to justify keeping endpoint in root.
tf.decode_raw - similar to other ops such as tf.decode_csv that are getting moved to tf.io.decode_csv.

PiperOrigin-RevId: 216278010