[SDK] Training Client Conditions related unit tests

[Bobbins228]

What this PR does / why we need it:
The following unit tests are added with this PR.

• get_job_conditions
• is_job_created
• is_job_running
• is_job_restarting
• is_job_failed
• is_job_succeeded

You can verify each unit test with the following command substituting <test_name> for one of the tests above.

pytest -v sdk/python/kubeflow/training/api/training_client_test.py -k <test_name>

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Related to #2161

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign jinchihe for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• sdk/python/OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[Bobbins228]

Let me know if this is too large for 1 PR.
Thought I would group them all together as they are very similar tests.

[coveralls]

Pull Request Test Coverage Report for Build 10789407864

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 10780524643:	0.0%
Covered Lines:	66
Relevant Lines:	66

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💛 - Coveralls