We're not running any test at all from `run_test.py` because of the way
we filter test cases:
1d136fd05f/src/python/grpcio_tests/tests/_runner.py (L137)
* `testcase_filter` is read from a json file (like [this
one](https://github.com/grpc/grpc/blob/master/src/python/grpcio_tests/tests/tests.json))
and test name is similar to `unit._metadata_test.MetadataTest`.
* `case.id()` is loaded by `iterate_suite_cases` and will always have a
prefix of `tests`, an example of case id will be:
`tests.unit._metadata_test.MetadataTest`.
Because of the prefix, none of the test case will be matched thus we're
not running any of the tests.
This PR fixes the prefix issue and all the regressions comes from not
running tests using `run_test.py`.
#### Other Changes
* Added couple of `__init__.py` file since it's required to load tests.
* Added `py_status_code` to Aio rpc state.
* `code()` is expecting to return a python gRPC code but current
`status_code` is a Cython code.
* Added `libsqlite3-dev` to our dockers because it's required for
`coverage==7.2.0`.
* Renamed csds and admin test because test case file have to end with
`_test`:
1d136fd05f/src/python/grpcio_tests/tests/_loader.py (L26)
* Removed gevent test from `run_test.py` because Bazel gevent tests
should be good enough for us.
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