chore(sdk): move tests to deprecated_tests

[connor-mccarthy]

Description of your changes:
Moves sdk/python/tests/ to sdk/python/deprecated_tests. This achieves two things:

1. Aligns the name of the tests with what they are testing, per out convention.
2. Locates the tests in a more intuitive location in our directory heirarchy, consistent with where other tests live.

Costs: Includes the deprecated_tests/ dir in the kfp package (820KB).

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.



[google-oss-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[google-oss-prow]

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[connor-mccarthy]

/test all

[google-oss-prow]

@connor-mccarthy: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
kubeflow-pipelines-samples-v2	6ad595c	link	true	/test kubeflow-pipelines-samples-v2

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[ji-yaqi]

Hi @connor-mccarthy, I feel we should be careful making directory changes as people might rely on our link as examples.

V1 is moving to deprecated folder to ensure coverage on sample tests (context: #7238). We will ultimately remove deprecated namespace and make it only in sdk/release-1.8 branch.

We might think of removing the tests folder ultimately, which might be better with a design doc of improving test infra overall and let users know for some time before removing them :)