fix: remove empy confusing trace/trace-python-sample directory

[iennae]

Description

Fixes #

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request removes the deprecated README file from the trace/trace-python-sample directory as part of a sample relocation. Feedback indicates that the links in the new destination README (trace/trace-python-sample-opentelemetry/README.rst) are currently incorrect and should be updated to point to the specific sample directory before this redirecting file is deleted.

[gemini-code-assist]

The Cloud Shell link in this file correctly points to the new sample directory. However, the links in the new README (trace/trace-python-sample-opentelemetry/README.rst, lines 7 and 74) appear to point to the parent trace/ directory instead. The new README should be updated with the correct paths before this redirecting file is removed.