What does this PR do?

Applies strip --strip-unneeded to all .so files included in the Python lambda layer.

Motivation

Frequent increases in Python lambda layer size, exceeding checks.
Stripping binaries further (originally only applied strip --strip-debug) can reduce the unzipped layer size by about 2.5MB.

Testing Guidelines

Ran serverless e2e tests and manually inspected traces on a Python sample app. Manually checked that profiling and appsec still produced appropriate output. Used layer arn:aws:lambda:us-west-2:425362996713:layer:Python312-strip-unneeded-rithika:1 on an ARM Python 3.12 lambda function.

Additional Notes

Types of Changes

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

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• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
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