test: Refactor core input size checks

[yinggeh]

What does the PR do?

Update tests to reflect changes in core.

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.
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Commit Type:

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• test

Related PRs:

triton-inference-server/core#382

Where should the reviewer start?

n/a

Test plan:

L0_input_validation--base

• CI Pipeline ID:
  18114270

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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