Properly compare floats in fully-connected-operator-tester (#82688)
Need to use `ASSERT_FLOAT_EQ` for floats.
Right now the test often fails internally like this:
```
xplat/caffe2/aten/src/ATen/native/quantized/cpu/qnnpack/test/fully-connected-operator-tester.h:362
Expected equality of these values:
output_dynamic[i * outputChannels() + c]
Which is: -601.09
((float)accumulators[i * outputChannels() + c] * requantization_scales[c]) + float(bias[c])
Which is: -601.09
at 0, 18: reference = -601.0899658203125, optimized = -601.09002685546875
```
```
xplat/caffe2/aten/src/ATen/native/quantized/cpu/qnnpack/test/fully-connected-operator-tester.h:362
Expected equality of these values:
output_dynamic[i * outputChannels() + c]
Which is: -65.6251
((float)accumulators[i * outputChannels() + c] * requantization_scales[c]) + float(bias[c])
Which is: -65.6251
at 0, 7: reference = -65.625106811523438, optimized = -65.625099182128906
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82688
Approved by: https://github.com/mehtanirav
