test: remove unneeded system test skip when using emulator

[larkee]

The functionality in test_partition_query is supported by the emulator. We should not be skipping it.

[hengfengli]

LGTM. When did they start supporting partitioned queries?

[larkee]

LGTM. When did they start supporting partitioned queries?

Unclear. However, the test does not give an UNIMPLEMENTED error. It instead give the following error:

E       AssertionError: Lists differ: [[1, 'First000000001', 'Last000000039', 'te[2782 chars]om']] != [[0, 'First000000000', 'Last000000040', 'te[2782 chars]om']]
E       
E       First differing element 0:
E       [1, 'First000000001', 'Last000000039', 'test-000000001@example.com']
E       [0, 'First000000000', 'Last000000040', 'test-000000000@example.com']
E       
E       Diff is 4732 characters long. Set self.maxDiff to None to see it.

So the functionality is implemented.

[larkee]

The above test failure is related to results order. There is no guarantee of order without using ORDER BY which is not supported by partitioned queries. I have a fix which I will make as a separate PR.