fix: remove unnecessary elementwise kernel

[narendasan]

Description

Removes the unnecessary elementwise kernel that gets invoked when output tensors are allocated then casted. Also fixes the search path for finding torch from the local venv to prioritize in repo venvs.

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)

cc: @shahe-nv

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
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