Remove google-perftools from the default image.

[tvalentyn]

Follow up for #38853 #20298.

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the Python SDK container image by removing the google-perftools dependency. This change reduces the size of the default image and encourages a more modular approach for users who require specific profiling tools like tcmalloc.

Highlights

• Container Optimization: Removed the google-perftools package from the Python SDK container image to reduce the default footprint.
• Breaking Change Documentation: Updated CHANGES.md to notify users that tcmalloc profiling now requires manual installation of google-perftools in custom container images.

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[gemini-code-assist]

Code Review

This pull request removes the google-perftools package from the Python SDK container images and documents this breaking change in CHANGES.md. The review feedback suggests minor formatting and grammatical improvements to the release notes entry for better clarity and consistency.

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[gemini-code-assist]

For better readability and consistency, consider wrapping google-perftools in backticks as it refers to a package name, capitalizing 'APT', and adding the article 'the' to make the sentence grammatically complete.

Suggested change:

* (Python) Removed `google-perftools` from the SDK container images. Users who wish to use `--profiler_agent=tcmalloc` should install the `google-perftools` APT package in their custom container images separately.

[shunping]

LGTM