* Fix 'cannot estimate element if precision is UNSPECIFIED' error caused by LPT
In some models after ConvMulFusion and FakeQuantizeMulFusion, output_low contains
denorms. That is problematic since LayerTransformation::getPrecisionDetails function checks
if output_low is close to zero and if it is - the function sets 'signedPrecision' flag to false.
In that case, both 'signedPrecision' and 'unsignedPrecision' are set to false and that makes
getPrecisionDetails return element::undefined.
This patch changes zeroThreshold to handle denorms.
Ticket: 65375
* fix FakeQuantizeTransformation tests
65c3b4c357