…mplates/python_library/.kokoro (#484)

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…p/templates/python_library/.kokoro (#486)

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* fix: Add async context manager return types

chore: Mock return_value should not populate oneof message fields

chore: Support snippet generation for services that only support REST transport

chore: Update gapic-generator-python to v1.11.0
PiperOrigin-RevId: 545430278

Source-Link: googleapis/googleapis@601b532

Source-Link: https://github.com/googleapis/googleapis-gen/commit/b3f18d0f6560a855022fd058865e7620479d7af9
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