set unload to false to prevent crash when linux lib load not successfully (#20626)
### Description
<!-- Describe your changes. -->
during VITSIAI shared library load, set unload to false to prevent crash
when linux lib load not successfully
### 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. -->
for Linux environment, when library not loaded successfully, it will end
up with crash without giving any useful message.
the fix is to prevent the crash and give the useful message when shared
library not loaded correctly.