test: Add tests for the Triton log callback

[pskiran1]

What does the PR do?

Adds QA coverage for the log callback feature. Builds and runs the common logging_test as part of L0_logging, and runs the new test_logging_callback.py in L0_python_api.

Checklist

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• Related issues are referenced.
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• Added test plan and verified test passes.
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Commit Type:

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

Related PRs:

• https://github.com/triton-inference-server/dynamo/pull/2
• feat: Add log callback option to tritonserver C and Python APIs core#504
• feat: Support a log callback in the common Logger common#158

Where should the reviewer start?

Test plan:

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Background

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

• closes GitHub issue: #xxx