Add Yuki to reviewer group

[johnugeorge]

Yuki has actively contributed in training operator for more than a year(Reviews, PRs, Docs). Thanks for all your efforts to make this operator better. I propose him to be in the reviewer group for the training operator.

https://github.com/kubeflow/training-operator/commits?author=tenzen-y

/assign @kubeflow/wg-training-leads

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johnugeorge

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• OWNERS [johnugeorge]

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[coveralls]

Pull Request Test Coverage Report for Build 3984711217

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 12 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.1%) to 39.168%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/paddlepaddle/paddlepaddle_controller.go	3	53.63%
pkg/controller.v1/pytorch/pytorchjob_controller.go	9	58.16%

Totals
Change from base Build 3980850357:	0.1%
Covered Lines:	2692
Relevant Lines:	6873

---

💛 - Coveralls

[johnugeorge]

/assign @terrytangyuan @gaocegege

[gaocegege]

/lgtm

@tenzen-y Thanks for your contribution!

[tenzen-y]

Thanks to all WG Training Leads!

[terrytangyuan]

Congrats! Thank you for your contributions!