fix: Fix requested output deleting extra outputs

[kthui]

What does the PR do?

RCA: When deleting NumPy arrays in C++, GIL must be held.

Fixes:

• Ensure GIL is held when deleting NumPy arrays behind tensor objects - fix RCA.
• Update shutdown step to ensure Python objects are actually deleted during destructor execution.

Checklist

• PR title reflects the change and is of format <commit_type>: <Title>
• Changes are described in the pull request.
• Related issues are referenced.
• Populated github labels field
• Added test plan and verified test passes.
• Verified that the PR passes existing CI.
• Verified copyright is correct on all changed files.
• Added succinct git squash message before merging ref.
• All template sections are filled out.
• Optional: Additional screenshots for behavior/output changes with before/after.

Commit Type:

Check the conventional commit type
box here and add the label to the github PR.

• build
• ci
• docs
• feat
• fix
• perf
• refactor
• revert
• style
• test

Related PRs:

triton-inference-server/server#7866

Where should the reviewer start?

Look at this PR first, and then move on to the related PR for the new test.

Test plan:

A new test is added to the related PR that enhances requested output testing.

• CI Pipeline ID: 21321591

Caveats:

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Background

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Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

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[krishung5]

Nice find, Jacky!