Use sam/build-python images for building layers.

[purple4reina]

What does this PR do?

Changes the base image for building layers.

Motivation

If trying to install ddtrace from source, it will build all of the c binaries. When using the currently defined base image to build ddtrace, it gives the following error when executing the lambda function:

[ERROR] Runtime.ImportModuleError: Unable to import module 'datadog_lambda.handler': /lib64/libstdc++.so.6: version 'GLIBCXX_3.4.30' not found (required by /opt/python/lib/python3.12/site-packages/ddtrace/internal/_threads.cpython-312-aarch64-linux-gnu.so) 

We are guaranteed that the glibc versions will properly match between the sam/build-python images and the lambda/python image.

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
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