This PR removes lib injection test images from this repo in favor of the ones in system-tests. The images in this repository were not used since the migration to one-pipeline and the transition from Github actions to Gitlab for kubernetes lib injection tests.

There was some confusion as to which images to update for tests.

To capture the changes that have been mistakenly applied to dd-trace-py images, there is a sister PR in system-tests: DataDog/system-tests#3089

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