[QNN-EP] Translate FP-to-Bool Cast by NotEqual. (#24466)
### Description
<!-- Describe your changes. -->
For QNN-EP, build FP-to-Bool Cast into NotEqual.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
HTP currently does not support FP-to-Bool Cast due to some limitations.
To unblock CLIP models, replace such Cast with NotEqual to achieve the
same functionality.
Co-authored-by: minfhong-quic <minfhong-quic@quicinc.com>
