onnxruntime

[QNN EP] Fix segfault when unregistering HTP shared memory handles (#23402)

### Description
- Fixes segfault when the function that cleans up HTP memory handles
uses an invalid Logger.
- Fixes unit test that compares output from QNN EP with exact float
values. QNN HTP runs float32 models with float16 precision, so need to
use a tolerance in the comparison.



### Motivation and Context
Fixes issues with using QNN HTP memory sharing on Windows ARM64. This is
also needed to test HTP shared memory with
https://github.com/microsoft/onnxruntime/pull/23120.