Enabled embedded_launcher: true on python tests

We're making embedded_launcher: true the default, and these tests don't
currently work with it. They assume there are .py files on the
filesystem, but with embedded_launcher, the python source files will
not be extracted out of the test binary.

Bug: 331488610
Test: m treble_manifest_split_test treble_build_test && /ssd/aosp-main/out/host/linux-x86/nativetest64/treble_build_test/treble_build_test && /ssd/aosp-main/out/host/linux-x86/nativetest64/treble_manifest_split_test/treble_manifest_split_test
Change-Id: Ib2c144381b06577378e47f1b2529de44312eb623
7 files changed